1	// © 2016 and later: Unicode, Inc. and others.
2	// License & terms of use: http://www.unicode.org/copyright.html
3	/*
4	*******************************************************************************
5	* Copyright (C) 1996-2016, International Business Machines
6	* Corporation and others. All Rights Reserved.
7	*******************************************************************************
8	*/
9
10	#ifndef UDAT_H
11	#define UDAT_H
12
13	#include "unicode/utypes.h"
14
15	#if !UCONFIG_NO_FORMATTING
16
17	#include "unicode/ucal.h"
18	#include "unicode/unum.h"
19	#include "unicode/udisplaycontext.h"
20	#include "unicode/ufieldpositer.h"
21
22	#if U_SHOW_CPLUSPLUS_API
23	#include "unicode/localpointer.h"
24	#endif // U_SHOW_CPLUSPLUS_API
25
26	/**
27	* \file
28	* \brief C API: DateFormat
29	*
30	* <h2> Date Format C API</h2>
31	*
32	* Date Format C API consists of functions that convert dates and
33	* times from their internal representations to textual form and back again in a
34	* language-independent manner. Converting from the internal representation (milliseconds
35	* since midnight, January 1, 1970) to text is known as "formatting," and converting
36	* from text to millis is known as "parsing." We currently define only one concrete
37	* structure UDateFormat, which can handle pretty much all normal
38	* date formatting and parsing actions.
39	* <P>
40	* Date Format helps you to format and parse dates for any locale. Your code can
41	* be completely independent of the locale conventions for months, days of the
42	* week, or even the calendar format: lunar vs. solar.
43	* <P>
44	* To format a date for the current Locale with default time and date style,
45	* use one of the static factory methods:
46	* <pre>
47	* \code
48	* UErrorCode status = U_ZERO_ERROR;
49	* UChar *myString;
50	* int32_t myStrlen = 0;
51	* UDateFormat* dfmt = udat_open(UDAT_DEFAULT, UDAT_DEFAULT, NULL, NULL, -1, NULL, -1, &status);
52	* myStrlen = udat_format(dfmt, myDate, NULL, myStrlen, NULL, &status);
53	* if (status==U_BUFFER_OVERFLOW_ERROR){
54	* status=U_ZERO_ERROR;
55	* myString=(UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
56	* udat_format(dfmt, myDate, myString, myStrlen+1, NULL, &status);
57	* }
58	* \endcode
59	* </pre>
60	* If you are formatting multiple numbers, it is more efficient to get the
61	* format and use it multiple times so that the system doesn't have to fetch the
62	* information about the local language and country conventions multiple times.
63	* <pre>
64	* \code
65	* UErrorCode status = U_ZERO_ERROR;
66	* int32_t i, myStrlen = 0;
67	* UChar* myString;
68	* char buffer[1024];
69	* UDate myDateArr[] = { 0.0, 100000000.0, 2000000000.0 }; // test values
70	* UDateFormat* df = udat_open(UDAT_DEFAULT, UDAT_DEFAULT, NULL, NULL, -1, NULL, 0, &status);
71	* for (i = 0; i < 3; i++) {
72	* myStrlen = udat_format(df, myDateArr[i], NULL, myStrlen, NULL, &status);
73	* if(status == U_BUFFER_OVERFLOW_ERROR){
74	* status = U_ZERO_ERROR;
75	* myString = (UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
76	* udat_format(df, myDateArr[i], myString, myStrlen+1, NULL, &status);
77	* printf("%s\n", u_austrcpy(buffer, myString) );
78	* free(myString);
79	* }
80	* }
81	* \endcode
82	* </pre>
83	* To get specific fields of a date, you can use UFieldPosition to
84	* get specific fields.
85	* <pre>
86	* \code
87	* UErrorCode status = U_ZERO_ERROR;
88	* UFieldPosition pos;
89	* UChar *myString;
90	* int32_t myStrlen = 0;
91	* char buffer[1024];
92	*
93	* pos.field = 1; // Same as the DateFormat::EField enum
94	* UDateFormat* dfmt = udat_open(UDAT_DEFAULT, UDAT_DEFAULT, NULL, -1, NULL, 0, &status);
95	* myStrlen = udat_format(dfmt, myDate, NULL, myStrlen, &pos, &status);
96	* if (status==U_BUFFER_OVERFLOW_ERROR){
97	* status=U_ZERO_ERROR;
98	* myString=(UChar*)malloc(sizeof(UChar) * (myStrlen+1) );
99	* udat_format(dfmt, myDate, myString, myStrlen+1, &pos, &status);
100	* }
101	* printf("date format: %s\n", u_austrcpy(buffer, myString));
102	* buffer[pos.endIndex] = 0; // NULL terminate the string.
103	* printf("UFieldPosition position equals %s\n", &buffer[pos.beginIndex]);
104	* \endcode
105	* </pre>
106	* To format a date for a different Locale, specify it in the call to
107	* udat_open()
108	* <pre>
109	* \code
110	* UDateFormat* df = udat_open(UDAT_SHORT, UDAT_SHORT, "fr_FR", NULL, -1, NULL, 0, &status);
111	* \endcode
112	* </pre>
113	* You can use a DateFormat API udat_parse() to parse.
114	* <pre>
115	* \code
116	* UErrorCode status = U_ZERO_ERROR;
117	* int32_t parsepos=0;
118	* UDate myDate = udat_parse(df, myString, u_strlen(myString), &parsepos, &status);
119	* \endcode
120	* </pre>
121	* You can pass in different options for the arguments for date and time style
122	* to control the length of the result; from SHORT to MEDIUM to LONG to FULL.
123	* The exact result depends on the locale, but generally:
124	* see UDateFormatStyle for more details
125	* <ul type=round>
126	* <li> UDAT_SHORT is completely numeric, such as 12/13/52 or 3:30pm
127	* <li> UDAT_MEDIUM is longer, such as Jan 12, 1952
128	* <li> UDAT_LONG is longer, such as January 12, 1952 or 3:30:32pm
129	* <li> UDAT_FULL is pretty completely specified, such as
130	* Tuesday, April 12, 1952 AD or 3:30:42pm PST.
131	* </ul>
132	* You can also set the time zone on the format if you wish.
133	* <P>
134	* You can also use forms of the parse and format methods with Parse Position and
135	* UFieldPosition to allow you to
136	* <ul type=round>
137	* <li> Progressively parse through pieces of a string.
138	* <li> Align any particular field, or find out where it is for selection
139	* on the screen.
140	* </ul>
141	* <p><strong>Date and Time Patterns:</strong></p>
142	*
143	* <p>Date and time formats are specified by <em>date and time pattern</em> strings.
144	* Within date and time pattern strings, all unquoted ASCII letters [A-Za-z] are reserved
145	* as pattern letters representing calendar fields. <code>UDateFormat</code> supports
146	* the date and time formatting algorithm and pattern letters defined by
147	* <a href="http://www.unicode.org/reports/tr35/tr35-dates.html#Date_Field_Symbol_Table">UTS#35
148	* Unicode Locale Data Markup Language (LDML)</a> and further documented for ICU in the
149	* <a href="https://unicode-org.github.io/icu/userguide/format_parse/datetime#date-field-symbol-table">ICU
150	* User Guide</a>.</p>
151	*/
152
153	/** A date formatter.
154	* For usage in C programs.
155	* @stable ICU 2.6
156	*/
157	typedef void* UDateFormat;
158
159	/** The possible date/time format styles
160	* @stable ICU 2.6
161	*/
162	typedef enum UDateFormatStyle {
163	/** Full style */
164	UDAT_FULL,
165	/** Long style */
166	UDAT_LONG,
167	/** Medium style */
168	UDAT_MEDIUM,
169	/** Short style */
170	UDAT_SHORT,
171	/** Default style */
172	UDAT_DEFAULT = UDAT_MEDIUM,
173
174	/** Bitfield for relative date */
175	UDAT_RELATIVE = (1 << 7),
176
177	UDAT_FULL_RELATIVE = UDAT_FULL | UDAT_RELATIVE,
178
179	UDAT_LONG_RELATIVE = UDAT_LONG | UDAT_RELATIVE,
180
181	UDAT_MEDIUM_RELATIVE = UDAT_MEDIUM | UDAT_RELATIVE,
182
183	UDAT_SHORT_RELATIVE = UDAT_SHORT | UDAT_RELATIVE,
184
185
186	/** No style */
187	UDAT_NONE = -1,
188
189	/**
190	* Use the pattern given in the parameter to udat_open
191	* @see udat_open
192	* @stable ICU 50
193	*/
194	UDAT_PATTERN = -2,
195
196	#ifndef U_HIDE_INTERNAL_API
197	/** @internal alias to UDAT_PATTERN */
198	UDAT_IGNORE = UDAT_PATTERN
199	#endif /* U_HIDE_INTERNAL_API */
200	} UDateFormatStyle;
201
202	/* Skeletons for dates. */
203
204	/**
205	* Constant for date skeleton with year.
206	* @stable ICU 4.0
207	*/
208	#define UDAT_YEAR "y"
209	/**
210	* Constant for date skeleton with quarter.
211	* @stable ICU 51
212	*/
213	#define UDAT_QUARTER "QQQQ"
214	/**
215	* Constant for date skeleton with abbreviated quarter.
216	* @stable ICU 51
217	*/
218	#define UDAT_ABBR_QUARTER "QQQ"
219	/**
220	* Constant for date skeleton with year and quarter.
221	* @stable ICU 4.0
222	*/
223	#define UDAT_YEAR_QUARTER "yQQQQ"
224	/**
225	* Constant for date skeleton with year and abbreviated quarter.
226	* @stable ICU 4.0
227	*/
228	#define UDAT_YEAR_ABBR_QUARTER "yQQQ"
229	/**
230	* Constant for date skeleton with month.
231	* @stable ICU 4.0
232	*/
233	#define UDAT_MONTH "MMMM"
234	/**
235	* Constant for date skeleton with abbreviated month.
236	* @stable ICU 4.0
237	*/
238	#define UDAT_ABBR_MONTH "MMM"
239	/**
240	* Constant for date skeleton with numeric month.
241	* @stable ICU 4.0
242	*/
243	#define UDAT_NUM_MONTH "M"
244	/**
245	* Constant for date skeleton with year and month.
246	* @stable ICU 4.0
247	*/
248	#define UDAT_YEAR_MONTH "yMMMM"
249	/**
250	* Constant for date skeleton with year and abbreviated month.
251	* @stable ICU 4.0
252	*/
253	#define UDAT_YEAR_ABBR_MONTH "yMMM"
254	/**
255	* Constant for date skeleton with year and numeric month.
256	* @stable ICU 4.0
257	*/
258	#define UDAT_YEAR_NUM_MONTH "yM"
259	/**
260	* Constant for date skeleton with day.
261	* @stable ICU 4.0
262	*/
263	#define UDAT_DAY "d"
264	/**
265	* Constant for date skeleton with year, month, and day.
266	* Used in combinations date + time, date + time + zone, or time + zone.
267	* @stable ICU 4.0
268	*/
269	#define UDAT_YEAR_MONTH_DAY "yMMMMd"
270	/**
271	* Constant for date skeleton with year, abbreviated month, and day.
272	* Used in combinations date + time, date + time + zone, or time + zone.
273	* @stable ICU 4.0
274	*/
275	#define UDAT_YEAR_ABBR_MONTH_DAY "yMMMd"
276	/**
277	* Constant for date skeleton with year, numeric month, and day.
278	* Used in combinations date + time, date + time + zone, or time + zone.
279	* @stable ICU 4.0
280	*/
281	#define UDAT_YEAR_NUM_MONTH_DAY "yMd"
282	/**
283	* Constant for date skeleton with weekday.
284	* @stable ICU 51
285	*/
286	#define UDAT_WEEKDAY "EEEE"
287	/**
288	* Constant for date skeleton with abbreviated weekday.
289	* @stable ICU 51
290	*/
291	#define UDAT_ABBR_WEEKDAY "E"
292	/**
293	* Constant for date skeleton with year, month, weekday, and day.
294	* Used in combinations date + time, date + time + zone, or time + zone.
295	* @stable ICU 4.0
296	*/
297	#define UDAT_YEAR_MONTH_WEEKDAY_DAY "yMMMMEEEEd"
298	/**
299	* Constant for date skeleton with year, abbreviated month, weekday, and day.
300	* Used in combinations date + time, date + time + zone, or time + zone.
301	* @stable ICU 4.0
302	*/
303	#define UDAT_YEAR_ABBR_MONTH_WEEKDAY_DAY "yMMMEd"
304	/**
305	* Constant for date skeleton with year, numeric month, weekday, and day.
306	* Used in combinations date + time, date + time + zone, or time + zone.
307	* @stable ICU 4.0
308	*/
309	#define UDAT_YEAR_NUM_MONTH_WEEKDAY_DAY "yMEd"
310	/**
311	* Constant for date skeleton with long month and day.
312	* Used in combinations date + time, date + time + zone, or time + zone.
313	* @stable ICU 4.0
314	*/
315	#define UDAT_MONTH_DAY "MMMMd"
316	/**
317	* Constant for date skeleton with abbreviated month and day.
318	* Used in combinations date + time, date + time + zone, or time + zone.
319	* @stable ICU 4.0
320	*/
321	#define UDAT_ABBR_MONTH_DAY "MMMd"
322	/**
323	* Constant for date skeleton with numeric month and day.
324	* Used in combinations date + time, date + time + zone, or time + zone.
325	* @stable ICU 4.0
326	*/
327	#define UDAT_NUM_MONTH_DAY "Md"
328	/**
329	* Constant for date skeleton with month, weekday, and day.
330	* Used in combinations date + time, date + time + zone, or time + zone.
331	* @stable ICU 4.0
332	*/
333	#define UDAT_MONTH_WEEKDAY_DAY "MMMMEEEEd"
334	/**
335	* Constant for date skeleton with abbreviated month, weekday, and day.
336	* Used in combinations date + time, date + time + zone, or time + zone.
337	* @stable ICU 4.0
338	*/
339	#define UDAT_ABBR_MONTH_WEEKDAY_DAY "MMMEd"
340	/**
341	* Constant for date skeleton with numeric month, weekday, and day.
342	* Used in combinations date + time, date + time + zone, or time + zone.
343	* @stable ICU 4.0
344	*/
345	#define UDAT_NUM_MONTH_WEEKDAY_DAY "MEd"
346
347	/* Skeletons for times. */
348
349	/**
350	* Constant for date skeleton with hour, with the locale's preferred hour format (12 or 24).
351	* @stable ICU 4.0
352	*/
353	#define UDAT_HOUR "j"
354	/**
355	* Constant for date skeleton with hour in 24-hour presentation.
356	* @stable ICU 51
357	*/
358	#define UDAT_HOUR24 "H"
359	/**
360	* Constant for date skeleton with minute.
361	* @stable ICU 51
362	*/
363	#define UDAT_MINUTE "m"
364	/**
365	* Constant for date skeleton with hour and minute, with the locale's preferred hour format (12 or 24).
366	* Used in combinations date + time, date + time + zone, or time + zone.
367	* @stable ICU 4.0
368	*/
369	#define UDAT_HOUR_MINUTE "jm"
370	/**
371	* Constant for date skeleton with hour and minute in 24-hour presentation.
372	* Used in combinations date + time, date + time + zone, or time + zone.
373	* @stable ICU 4.0
374	*/
375	#define UDAT_HOUR24_MINUTE "Hm"
376	/**
377	* Constant for date skeleton with second.
378	* @stable ICU 51
379	*/
380	#define UDAT_SECOND "s"
381	/**
382	* Constant for date skeleton with hour, minute, and second,
383	* with the locale's preferred hour format (12 or 24).
384	* Used in combinations date + time, date + time + zone, or time + zone.
385	* @stable ICU 4.0
386	*/
387	#define UDAT_HOUR_MINUTE_SECOND "jms"
388	/**
389	* Constant for date skeleton with hour, minute, and second in
390	* 24-hour presentation.
391	* Used in combinations date + time, date + time + zone, or time + zone.
392	* @stable ICU 4.0
393	*/
394	#define UDAT_HOUR24_MINUTE_SECOND "Hms"
395	/**
396	* Constant for date skeleton with minute and second.
397	* Used in combinations date + time, date + time + zone, or time + zone.
398	* @stable ICU 4.0
399	*/
400	#define UDAT_MINUTE_SECOND "ms"
401
402	/* Skeletons for time zones. */
403
404	/**
405	* Constant for <i>generic location format</i>, such as Los Angeles Time;
406	* used in combinations date + time + zone, or time + zone.
407	* @see <a href="http://unicode.org/reports/tr35/#Date_Format_Patterns">LDML Date Format Patterns</a>
408	* @see <a href="http://unicode.org/reports/tr35/#Time_Zone_Fallback">LDML Time Zone Fallback</a>
409	* @stable ICU 51
410	*/
411	#define UDAT_LOCATION_TZ "VVVV"
412	/**
413	* Constant for <i>generic non-location format</i>, such as Pacific Time;
414	* used in combinations date + time + zone, or time + zone.
415	* @see <a href="http://unicode.org/reports/tr35/#Date_Format_Patterns">LDML Date Format Patterns</a>
416	* @see <a href="http://unicode.org/reports/tr35/#Time_Zone_Fallback">LDML Time Zone Fallback</a>
417	* @stable ICU 51
418	*/
419	#define UDAT_GENERIC_TZ "vvvv"
420	/**
421	* Constant for <i>generic non-location format</i>, abbreviated if possible, such as PT;
422	* used in combinations date + time + zone, or time + zone.
423	* @see <a href="http://unicode.org/reports/tr35/#Date_Format_Patterns">LDML Date Format Patterns</a>
424	* @see <a href="http://unicode.org/reports/tr35/#Time_Zone_Fallback">LDML Time Zone Fallback</a>
425	* @stable ICU 51
426	*/
427	#define UDAT_ABBR_GENERIC_TZ "v"
428	/**
429	* Constant for <i>specific non-location format</i>, such as Pacific Daylight Time;
430	* used in combinations date + time + zone, or time + zone.
431	* @see <a href="http://unicode.org/reports/tr35/#Date_Format_Patterns">LDML Date Format Patterns</a>
432	* @see <a href="http://unicode.org/reports/tr35/#Time_Zone_Fallback">LDML Time Zone Fallback</a>
433	* @stable ICU 51
434	*/
435	#define UDAT_SPECIFIC_TZ "zzzz"
436	/**
437	* Constant for <i>specific non-location format</i>, abbreviated if possible, such as PDT;
438	* used in combinations date + time + zone, or time + zone.
439	* @see <a href="http://unicode.org/reports/tr35/#Date_Format_Patterns">LDML Date Format Patterns</a>
440	* @see <a href="http://unicode.org/reports/tr35/#Time_Zone_Fallback">LDML Time Zone Fallback</a>
441	* @stable ICU 51
442	*/
443	#define UDAT_ABBR_SPECIFIC_TZ "z"
444	/**
445	* Constant for <i>localized GMT/UTC format</i>, such as GMT+8:00 or HPG-8:00;
446	* used in combinations date + time + zone, or time + zone.
447	* @see <a href="http://unicode.org/reports/tr35/#Date_Format_Patterns">LDML Date Format Patterns</a>
448	* @see <a href="http://unicode.org/reports/tr35/#Time_Zone_Fallback">LDML Time Zone Fallback</a>
449	* @stable ICU 51
450	*/
451	#define UDAT_ABBR_UTC_TZ "ZZZZ"
452
453	/* deprecated skeleton constants */
454
455	#ifndef U_HIDE_DEPRECATED_API
456	/**
457	* Constant for date skeleton with standalone month.
458	* @deprecated ICU 50 Use UDAT_MONTH instead.
459	*/
460	#define UDAT_STANDALONE_MONTH "LLLL"
461	/**
462	* Constant for date skeleton with standalone abbreviated month.
463	* @deprecated ICU 50 Use UDAT_ABBR_MONTH instead.
464	*/
465	#define UDAT_ABBR_STANDALONE_MONTH "LLL"
466
467	/**
468	* Constant for date skeleton with hour, minute, and generic timezone.
469	* @deprecated ICU 50 Use instead UDAT_HOUR_MINUTE UDAT_ABBR_GENERIC_TZ or some other timezone presentation.
470	*/
471	#define UDAT_HOUR_MINUTE_GENERIC_TZ "jmv"
472	/**
473	* Constant for date skeleton with hour, minute, and timezone.
474	* @deprecated ICU 50 Use instead UDAT_HOUR_MINUTE UDAT_ABBR_SPECIFIC_TZ or some other timezone presentation.
475	*/
476	#define UDAT_HOUR_MINUTE_TZ "jmz"
477	/**
478	* Constant for date skeleton with hour and generic timezone.
479	* @deprecated ICU 50 Use instead UDAT_HOUR UDAT_ABBR_GENERIC_TZ or some other timezone presentation.
480	*/
481	#define UDAT_HOUR_GENERIC_TZ "jv"
482	/**
483	* Constant for date skeleton with hour and timezone.
484	* @deprecated ICU 50 Use instead UDAT_HOUR UDAT_ABBR_SPECIFIC_TZ or some other timezone presentation.
485	*/
486	#define UDAT_HOUR_TZ "jz"
487	#endif /* U_HIDE_DEPRECATED_API */
488
489	#ifndef U_HIDE_INTERNAL_API
490	/**
491	* Constant for Unicode string name of new (in 2019) Japanese calendar era,
492	* root/English abbreviated version (ASCII-range characters).
493	* @internal
494	*/
495	#define JP_ERA_2019_ROOT "Reiwa"
496	/**
497	* Constant for Unicode string name of new (in 2019) Japanese calendar era,
498	* Japanese abbreviated version (Han, or fullwidth Latin for testing).
499	* @internal
500	*/
501	#define JP_ERA_2019_JA "\\u4EE4\\u548C"
502	/**
503	* Constant for Unicode string name of new (in 2019) Japanese calendar era,
504	* root and Japanese narrow version (ASCII-range characters).
505	* @internal
506	*/
507	#define JP_ERA_2019_NARROW "R"
508	#endif // U_HIDE_INTERNAL_API
509
510	/**
511	* FieldPosition and UFieldPosition selectors for format fields
512	* defined by DateFormat and UDateFormat.
513	* @stable ICU 3.0
514	*/
515	typedef enum UDateFormatField {
516	/**
517	* FieldPosition and UFieldPosition selector for 'G' field alignment,
518	* corresponding to the UCAL_ERA field.
519	* @stable ICU 3.0
520	*/
521	UDAT_ERA_FIELD = 0,
522
523	/**
524	* FieldPosition and UFieldPosition selector for 'y' field alignment,
525	* corresponding to the UCAL_YEAR field.
526	* @stable ICU 3.0
527	*/
528	UDAT_YEAR_FIELD = 1,
529
530	/**
531	* FieldPosition and UFieldPosition selector for 'M' field alignment,
532	* corresponding to the UCAL_MONTH field.
533	* @stable ICU 3.0
534	*/
535	UDAT_MONTH_FIELD = 2,
536
537	/**
538	* FieldPosition and UFieldPosition selector for 'd' field alignment,
539	* corresponding to the UCAL_DATE field.
540	* @stable ICU 3.0
541	*/
542	UDAT_DATE_FIELD = 3,
543
544	/**
545	* FieldPosition and UFieldPosition selector for 'k' field alignment,
546	* corresponding to the UCAL_HOUR_OF_DAY field.
547	* UDAT_HOUR_OF_DAY1_FIELD is used for the one-based 24-hour clock.
548	* For example, 23:59 + 01:00 results in 24:59.
549	* @stable ICU 3.0
550	*/
551	UDAT_HOUR_OF_DAY1_FIELD = 4,
552
553	/**
554	* FieldPosition and UFieldPosition selector for 'H' field alignment,
555	* corresponding to the UCAL_HOUR_OF_DAY field.
556	* UDAT_HOUR_OF_DAY0_FIELD is used for the zero-based 24-hour clock.
557	* For example, 23:59 + 01:00 results in 00:59.
558	* @stable ICU 3.0
559	*/
560	UDAT_HOUR_OF_DAY0_FIELD = 5,
561
562	/**
563	* FieldPosition and UFieldPosition selector for 'm' field alignment,
564	* corresponding to the UCAL_MINUTE field.
565	* @stable ICU 3.0
566	*/
567	UDAT_MINUTE_FIELD = 6,
568
569	/**
570	* FieldPosition and UFieldPosition selector for 's' field alignment,
571	* corresponding to the UCAL_SECOND field.
572	* @stable ICU 3.0
573	*/
574	UDAT_SECOND_FIELD = 7,
575
576	/**
577	* FieldPosition and UFieldPosition selector for 'S' field alignment,
578	* corresponding to the UCAL_MILLISECOND field.
579	*
580	* Note: Time formats that use 'S' can display a maximum of three
581	* significant digits for fractional seconds, corresponding to millisecond
582	* resolution and a fractional seconds sub-pattern of SSS. If the
583	* sub-pattern is S or SS, the fractional seconds value will be truncated
584	* (not rounded) to the number of display places specified. If the
585	* fractional seconds sub-pattern is longer than SSS, the additional
586	* display places will be filled with zeros.
587	* @stable ICU 3.0
588	*/
589	UDAT_FRACTIONAL_SECOND_FIELD = 8,
590
591	/**
592	* FieldPosition and UFieldPosition selector for 'E' field alignment,
593	* corresponding to the UCAL_DAY_OF_WEEK field.
594	* @stable ICU 3.0
595	*/
596	UDAT_DAY_OF_WEEK_FIELD = 9,
597
598	/**
599	* FieldPosition and UFieldPosition selector for 'D' field alignment,
600	* corresponding to the UCAL_DAY_OF_YEAR field.
601	* @stable ICU 3.0
602	*/
603	UDAT_DAY_OF_YEAR_FIELD = 10,
604
605	/**
606	* FieldPosition and UFieldPosition selector for 'F' field alignment,
607	* corresponding to the UCAL_DAY_OF_WEEK_IN_MONTH field.
608	* @stable ICU 3.0
609	*/
610	UDAT_DAY_OF_WEEK_IN_MONTH_FIELD = 11,
611
612	/**
613	* FieldPosition and UFieldPosition selector for 'w' field alignment,
614	* corresponding to the UCAL_WEEK_OF_YEAR field.
615	* @stable ICU 3.0
616	*/
617	UDAT_WEEK_OF_YEAR_FIELD = 12,
618
619	/**
620	* FieldPosition and UFieldPosition selector for 'W' field alignment,
621	* corresponding to the UCAL_WEEK_OF_MONTH field.
622	* @stable ICU 3.0
623	*/
624	UDAT_WEEK_OF_MONTH_FIELD = 13,
625
626	/**
627	* FieldPosition and UFieldPosition selector for 'a' field alignment,
628	* corresponding to the UCAL_AM_PM field.
629	* @stable ICU 3.0
630	*/
631	UDAT_AM_PM_FIELD = 14,
632
633	/**
634	* FieldPosition and UFieldPosition selector for 'h' field alignment,
635	* corresponding to the UCAL_HOUR field.
636	* UDAT_HOUR1_FIELD is used for the one-based 12-hour clock.
637	* For example, 11:30 PM + 1 hour results in 12:30 AM.
638	* @stable ICU 3.0
639	*/
640	UDAT_HOUR1_FIELD = 15,
641
642	/**
643	* FieldPosition and UFieldPosition selector for 'K' field alignment,
644	* corresponding to the UCAL_HOUR field.
645	* UDAT_HOUR0_FIELD is used for the zero-based 12-hour clock.
646	* For example, 11:30 PM + 1 hour results in 00:30 AM.
647	* @stable ICU 3.0
648	*/
649	UDAT_HOUR0_FIELD = 16,
650
651	/**
652	* FieldPosition and UFieldPosition selector for 'z' field alignment,
653	* corresponding to the UCAL_ZONE_OFFSET and
654	* UCAL_DST_OFFSET fields.
655	* @stable ICU 3.0
656	*/
657	UDAT_TIMEZONE_FIELD = 17,
658
659	/**
660	* FieldPosition and UFieldPosition selector for 'Y' field alignment,
661	* corresponding to the UCAL_YEAR_WOY field.
662	* @stable ICU 3.0
663	*/
664	UDAT_YEAR_WOY_FIELD = 18,
665
666	/**
667	* FieldPosition and UFieldPosition selector for 'e' field alignment,
668	* corresponding to the UCAL_DOW_LOCAL field.
669	* @stable ICU 3.0
670	*/
671	UDAT_DOW_LOCAL_FIELD = 19,
672
673	/**
674	* FieldPosition and UFieldPosition selector for 'u' field alignment,
675	* corresponding to the UCAL_EXTENDED_YEAR field.
676	* @stable ICU 3.0
677	*/
678	UDAT_EXTENDED_YEAR_FIELD = 20,
679
680	/**
681	* FieldPosition and UFieldPosition selector for 'g' field alignment,
682	* corresponding to the UCAL_JULIAN_DAY field.
683	* @stable ICU 3.0
684	*/
685	UDAT_JULIAN_DAY_FIELD = 21,
686
687	/**
688	* FieldPosition and UFieldPosition selector for 'A' field alignment,
689	* corresponding to the UCAL_MILLISECONDS_IN_DAY field.
690	* @stable ICU 3.0
691	*/
692	UDAT_MILLISECONDS_IN_DAY_FIELD = 22,
693
694	/**
695	* FieldPosition and UFieldPosition selector for 'Z' field alignment,
696	* corresponding to the UCAL_ZONE_OFFSET and
697	* UCAL_DST_OFFSET fields.
698	* @stable ICU 3.0
699	*/
700	UDAT_TIMEZONE_RFC_FIELD = 23,
701
702	/**
703	* FieldPosition and UFieldPosition selector for 'v' field alignment,
704	* corresponding to the UCAL_ZONE_OFFSET field.
705	* @stable ICU 3.4
706	*/
707	UDAT_TIMEZONE_GENERIC_FIELD = 24,
708	/**
709	* FieldPosition selector for 'c' field alignment,
710	* corresponding to the {@link #UCAL_DOW_LOCAL} field.
711	* This displays the stand alone day name, if available.
712	* @stable ICU 3.4
713	*/
714	UDAT_STANDALONE_DAY_FIELD = 25,
715
716	/**
717	* FieldPosition selector for 'L' field alignment,
718	* corresponding to the {@link #UCAL_MONTH} field.
719	* This displays the stand alone month name, if available.
720	* @stable ICU 3.4
721	*/
722	UDAT_STANDALONE_MONTH_FIELD = 26,
723
724	/**
725	* FieldPosition selector for "Q" field alignment,
726	* corresponding to quarters. This is implemented
727	* using the {@link #UCAL_MONTH} field. This
728	* displays the quarter.
729	* @stable ICU 3.6
730	*/
731	UDAT_QUARTER_FIELD = 27,
732
733	/**
734	* FieldPosition selector for the "q" field alignment,
735	* corresponding to stand-alone quarters. This is
736	* implemented using the {@link #UCAL_MONTH} field.
737	* This displays the stand-alone quarter.
738	* @stable ICU 3.6
739	*/
740	UDAT_STANDALONE_QUARTER_FIELD = 28,
741
742	/**
743	* FieldPosition and UFieldPosition selector for 'V' field alignment,
744	* corresponding to the UCAL_ZONE_OFFSET field.
745	* @stable ICU 3.8
746	*/
747	UDAT_TIMEZONE_SPECIAL_FIELD = 29,
748
749	/**
750	* FieldPosition selector for "U" field alignment,
751	* corresponding to cyclic year names. This is implemented
752	* using the {@link #UCAL_YEAR} field. This displays
753	* the cyclic year name, if available.
754	* @stable ICU 49
755	*/
756	UDAT_YEAR_NAME_FIELD = 30,
757
758	/**
759	* FieldPosition selector for 'O' field alignment,
760	* corresponding to the UCAL_ZONE_OFFSET and UCAL_DST_OFFSETfields.
761	* This displays the localized GMT format.
762	* @stable ICU 51
763	*/
764	UDAT_TIMEZONE_LOCALIZED_GMT_OFFSET_FIELD = 31,
765
766	/**
767	* FieldPosition selector for 'X' field alignment,
768	* corresponding to the UCAL_ZONE_OFFSET and UCAL_DST_OFFSETfields.
769	* This displays the ISO 8601 local time offset format or UTC indicator ("Z").
770	* @stable ICU 51
771	*/
772	UDAT_TIMEZONE_ISO_FIELD = 32,
773
774	/**
775	* FieldPosition selector for 'x' field alignment,
776	* corresponding to the UCAL_ZONE_OFFSET and UCAL_DST_OFFSET fields.
777	* This displays the ISO 8601 local time offset format.
778	* @stable ICU 51
779	*/
780	UDAT_TIMEZONE_ISO_LOCAL_FIELD = 33,
781
782	#ifndef U_HIDE_INTERNAL_API
783	/**
784	* FieldPosition and UFieldPosition selector for 'r' field alignment,
785	* no directly corresponding UCAL_ field.
786	* @internal ICU 53
787	*/
788	UDAT_RELATED_YEAR_FIELD = 34,
789	#endif /* U_HIDE_INTERNAL_API */
790
791	/**
792	* FieldPosition selector for 'b' field alignment.
793	* Displays midnight and noon for 12am and 12pm, respectively, if available;
794	* otherwise fall back to AM / PM.
795	* @stable ICU 57
796	*/
797	UDAT_AM_PM_MIDNIGHT_NOON_FIELD = 35,
798
799	/* FieldPosition selector for 'B' field alignment.
800	* Displays flexible day periods, such as "in the morning", if available.
801	* @stable ICU 57
802	*/
803	UDAT_FLEXIBLE_DAY_PERIOD_FIELD = 36,
804
805	#ifndef U_HIDE_INTERNAL_API
806	/**
807	* FieldPosition and UFieldPosition selector for time separator,
808	* no corresponding UCAL_ field. No pattern character is currently
809	* defined for this.
810	* @internal
811	*/
812	UDAT_TIME_SEPARATOR_FIELD = 37,
813	#endif /* U_HIDE_INTERNAL_API */
814
815	#ifndef U_HIDE_DEPRECATED_API
816	/**
817	* Number of FieldPosition and UFieldPosition selectors for
818	* DateFormat and UDateFormat.
819	* Valid selectors range from 0 to UDAT_FIELD_COUNT-1.
820	* @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
821	*/
822	UDAT_FIELD_COUNT = 38
823	#endif /* U_HIDE_DEPRECATED_API */
824	} UDateFormatField;
825
826
827	#ifndef U_HIDE_INTERNAL_API
828	/**
829	* Is a pattern character defined for UDAT_TIME_SEPARATOR_FIELD?
830	* In ICU 55 it was COLON, but that was withdrawn in ICU 56.
831	* @internal ICU 56
832	*/
833	#define UDAT_HAS_PATTERN_CHAR_FOR_TIME_SEPARATOR 0
834	#endif /* U_HIDE_INTERNAL_API */
835
836
837	/**
838	* Maps from a UDateFormatField to the corresponding UCalendarDateFields.
839	*
840	* Note 1: Since the mapping is many-to-one, there is no inverse mapping.
841	*
842	* Note 2: There is no UErrorCode parameter, so in case of error (UDateFormatField is
843	* unknown or has no corresponding UCalendarDateFields value), the function returns the
844	* current value of UCAL_FIELD_COUNT. However, that value may change from release to
845	* release and is consequently deprecated. For a future-proof runtime way of checking
846	* for errors:
847	* a) First save the value returned by the function when it is passed an invalid value
848	* such as "(UDateFormatField)-1".
849	* b) Then, to test for errors when passing some other UDateFormatField value, check
850	* whether the function returns that saved value.
851	*
852	* @param field the UDateFormatField.
853	* @return the UCalendarDateField. In case of error (UDateFormatField is unknown or has
854	* no corresponding UCalendarDateFields value) this will be the current value of
855	* UCAL_FIELD_COUNT, but that value may change from release to release.
856	* See Note 2 above.
857	* @stable ICU 4.4
858	*/
859	U_CAPI UCalendarDateFields U_EXPORT2
860	udat_toCalendarDateField(UDateFormatField field);
861
862
863	/**
864	* Open a new UDateFormat for formatting and parsing dates and times.
865	* A UDateFormat may be used to format dates in calls to {@link #udat_format },
866	* and to parse dates in calls to {@link #udat_parse }.
867	* @param timeStyle The style used to format times; one of UDAT_FULL, UDAT_LONG,
868	* UDAT_MEDIUM, UDAT_SHORT, UDAT_DEFAULT, or UDAT_NONE (relative time styles
869	* are not currently supported).
870	* When the pattern parameter is used, pass in UDAT_PATTERN for both timeStyle and dateStyle.
871	* @param dateStyle The style used to format dates; one of UDAT_FULL, UDAT_LONG,
872	* UDAT_MEDIUM, UDAT_SHORT, UDAT_DEFAULT, UDAT_FULL_RELATIVE, UDAT_LONG_RELATIVE,
873	* UDAT_MEDIUM_RELATIVE, UDAT_SHORT_RELATIVE, or UDAT_NONE.
874	* When the pattern parameter is used, pass in UDAT_PATTERN for both timeStyle and dateStyle.
875	* As currently implemented,
876	* relative date formatting only affects a limited range of calendar days before or
877	* after the current date, based on the CLDR &lt;field type="day"&gt;/&lt;relative&gt; data: For
878	* example, in English, "Yesterday", "Today", and "Tomorrow". Outside of this range,
879	* dates are formatted using the corresponding non-relative style.
880	* @param locale The locale specifying the formatting conventions
881	* @param tzID A timezone ID specifying the timezone to use. If 0, use
882	* the default timezone.
883	* @param tzIDLength The length of tzID, or -1 if null-terminated.
884	* @param pattern A pattern specifying the format to use.
885	* @param patternLength The number of characters in the pattern, or -1 if null-terminated.
886	* @param status A pointer to an UErrorCode to receive any errors
887	* @return A pointer to a UDateFormat to use for formatting dates and times, or 0 if
888	* an error occurred.
889	* @stable ICU 2.0
890	*/
891	U_CAPI UDateFormat* U_EXPORT2
892	udat_open(UDateFormatStyle timeStyle,
893	UDateFormatStyle dateStyle,
894	const char *locale,
895	const UChar *tzID,
896	int32_t tzIDLength,
897	const UChar *pattern,
898	int32_t patternLength,
899	UErrorCode *status);
900
901
902	/**
903	* Close a UDateFormat.
904	* Once closed, a UDateFormat may no longer be used.
905	* @param format The formatter to close.
906	* @stable ICU 2.0
907	*/
908	U_CAPI void U_EXPORT2
909	udat_close(UDateFormat* format);
910
911
912	/**
913	* DateFormat boolean attributes
914	*
915	* @stable ICU 53
916	*/
917	typedef enum UDateFormatBooleanAttribute {
918	/**
919	* indicates whether whitespace is allowed. Includes trailing dot tolerance.
920	* @stable ICU 53
921	*/
922	UDAT_PARSE_ALLOW_WHITESPACE = 0,
923	/**
924	* indicates tolerance of numeric data when String data may be assumed. eg: UDAT_YEAR_NAME_FIELD,
925	* UDAT_STANDALONE_MONTH_FIELD, UDAT_DAY_OF_WEEK_FIELD
926	* @stable ICU 53
927	*/
928	UDAT_PARSE_ALLOW_NUMERIC = 1,
929	/**
930	* indicates tolerance of a partial literal match
931	* e.g. accepting "--mon-02-march-2011" for a pattern of "'--: 'EEE-WW-MMMM-yyyy"
932	* @stable ICU 56
933	*/
934	UDAT_PARSE_PARTIAL_LITERAL_MATCH = 2,
935	/**
936	* indicates tolerance of pattern mismatch between input data and specified format pattern.
937	* e.g. accepting "September" for a month pattern of MMM ("Sep")
938	* @stable ICU 56
939	*/
940	UDAT_PARSE_MULTIPLE_PATTERNS_FOR_MATCH = 3,
941
942	/* Do not conditionalize the following with #ifndef U_HIDE_DEPRECATED_API,
943	* it is needed for layout of DateFormat object. */
944	#ifndef U_FORCE_HIDE_DEPRECATED_API
945	/**
946	* One more than the highest normal UDateFormatBooleanAttribute value.
947	* @deprecated ICU 58 The numeric value may change over time, see ICU ticket #12420.
948	*/
949	UDAT_BOOLEAN_ATTRIBUTE_COUNT = 4
950	#endif // U_FORCE_HIDE_DEPRECATED_API
951	} UDateFormatBooleanAttribute;
952
953	/**
954	* Get a boolean attribute associated with a UDateFormat.
955	* An example would be a true value for a key of UDAT_PARSE_ALLOW_WHITESPACE indicating allowing whitespace leniency.
956	* If the formatter does not understand the attribute, -1 is returned.
957	* @param fmt The formatter to query.
958	* @param attr The attribute to query; e.g. UDAT_PARSE_ALLOW_WHITESPACE.
959	* @param status A pointer to an UErrorCode to receive any errors
960	* @return The value of attr.
961	* @stable ICU 53
962	*/
963	U_CAPI UBool U_EXPORT2
964	udat_getBooleanAttribute(const UDateFormat* fmt, UDateFormatBooleanAttribute attr, UErrorCode* status);
965
966	/**
967	* Set a boolean attribute associated with a UDateFormat.
968	* An example of a boolean attribute is parse leniency control. If the formatter does not understand
969	* the attribute, the call is ignored.
970	* @param fmt The formatter to set.
971	* @param attr The attribute to set; one of UDAT_PARSE_ALLOW_WHITESPACE or UDAT_PARSE_ALLOW_NUMERIC
972	* @param newValue The new value of attr.
973	* @param status A pointer to an UErrorCode to receive any errors
974	* @stable ICU 53
975	*/
976	U_CAPI void U_EXPORT2
977	udat_setBooleanAttribute(UDateFormat *fmt, UDateFormatBooleanAttribute attr, UBool newValue, UErrorCode* status);
978
979	/**
980	* Hour Cycle.
981	* @stable ICU 67
982	*/
983	typedef enum UDateFormatHourCycle {
984	/**
985	* Hour in am/pm (0~11)
986	* @stable ICU 67
987	*/
988	UDAT_HOUR_CYCLE_11,
989
990	/**
991	* Hour in am/pm (1~12)
992	* @stable ICU 67
993	*/
994	UDAT_HOUR_CYCLE_12,
995
996	/**
997	* Hour in day (0~23)
998	* @stable ICU 67
999	*/
1000	UDAT_HOUR_CYCLE_23,
1001
1002	/**
1003	* Hour in day (1~24)
1004	* @stable ICU 67
1005	*/
1006	UDAT_HOUR_CYCLE_24
1007	} UDateFormatHourCycle;
1008
1009	#if U_SHOW_CPLUSPLUS_API
1010
1011	U_NAMESPACE_BEGIN
1012
1013	/**
1014	* \class LocalUDateFormatPointer
1015	* "Smart pointer" class, closes a UDateFormat via udat_close().
1016	* For most methods see the LocalPointerBase base class.
1017	*
1018	* @see LocalPointerBase
1019	* @see LocalPointer
1020	* @stable ICU 4.4
1021	*/
1022	U_DEFINE_LOCAL_OPEN_POINTER(LocalUDateFormatPointer, UDateFormat, udat_close);
1023
1024	U_NAMESPACE_END
1025
1026	#endif
1027
1028	/**
1029	* Open a copy of a UDateFormat.
1030	* This function performs a deep copy.
1031	* @param fmt The format to copy
1032	* @param status A pointer to an UErrorCode to receive any errors.
1033	* @return A pointer to a UDateFormat identical to fmt.
1034	* @stable ICU 2.0
1035	*/
1036	U_CAPI UDateFormat* U_EXPORT2
1037	udat_clone(const UDateFormat *fmt,
1038	UErrorCode *status);
1039
1040	/**
1041	* Format a date using a UDateFormat.
1042	* The date will be formatted using the conventions specified in {@link #udat_open }
1043	* @param format The formatter to use
1044	* @param dateToFormat The date to format
1045	* @param result A pointer to a buffer to receive the formatted number.
1046	* @param resultLength The maximum size of result.
1047	* @param position A pointer to a UFieldPosition. On input, position->field
1048	* is read. On output, position->beginIndex and position->endIndex indicate
1049	* the beginning and ending indices of field number position->field, if such
1050	* a field exists. This parameter may be NULL, in which case no field
1051	* position data is returned.
1052	* @param status A pointer to an UErrorCode to receive any errors
1053	* @return The total buffer size needed; if greater than resultLength, the output was truncated.
1054	* @see udat_parse
1055	* @see UFieldPosition
1056	* @stable ICU 2.0
1057	*/
1058	U_CAPI int32_t U_EXPORT2
1059	udat_format( const UDateFormat* format,
1060	UDate dateToFormat,
1061	UChar* result,
1062	int32_t resultLength,
1063	UFieldPosition* position,
1064	UErrorCode* status);
1065
1066	/**
1067	* Format a date using an UDateFormat.
1068	* The date will be formatted using the conventions specified in {@link #udat_open }
1069	* @param format The formatter to use
1070	* @param calendar The calendar to format. The calendar instance might be
1071	* mutated if fields are not yet fully calculated, though
1072	* the function won't change the logical date and time held
1073	* by the instance.
1074	* @param result A pointer to a buffer to receive the formatted number.
1075	* @param capacity The maximum size of result.
1076	* @param position A pointer to a UFieldPosition. On input, position->field
1077	* is read. On output, position->beginIndex and position->endIndex indicate
1078	* the beginning and ending indices of field number position->field, if such
1079	* a field exists. This parameter may be NULL, in which case no field
1080	* position data is returned.
1081	* @param status A pointer to an UErrorCode to receive any errors
1082	* @return The total buffer size needed; if greater than resultLength, the output was truncated.
1083	* @see udat_format
1084	* @see udat_parseCalendar
1085	* @see UFieldPosition
1086	* @stable ICU 55
1087	*/
1088	U_CAPI int32_t U_EXPORT2
1089	udat_formatCalendar( const UDateFormat* format,
1090	UCalendar* calendar,
1091	UChar* result,
1092	int32_t capacity,
1093	UFieldPosition* position,
1094	UErrorCode* status);
1095
1096	/**
1097	* Format a date using a UDateFormat.
1098	* The date will be formatted using the conventions specified in {@link #udat_open}
1099	* @param format
1100	* The formatter to use
1101	* @param dateToFormat
1102	* The date to format
1103	* @param result
1104	* A pointer to a buffer to receive the formatted number.
1105	* @param resultLength
1106	* The maximum size of result.
1107	* @param fpositer
1108	* A pointer to a UFieldPositionIterator created by {@link #ufieldpositer_open}
1109	* (may be NULL if field position information is not needed). Any
1110	* iteration information already present in the UFieldPositionIterator
1111	* will be deleted, and the iterator will be reset to apply to the
1112	* fields in the formatted string created by this function call; the
1113	* field values provided by {@link #ufieldpositer_next} will be from the
1114	* UDateFormatField enum.
1115	* @param status
1116	* A pointer to a UErrorCode to receive any errors
1117	* @return
1118	* The total buffer size needed; if greater than resultLength, the output was truncated.
1119	* @see udat_parse
1120	* @see UFieldPositionIterator
1121	* @stable ICU 55
1122	*/
1123	U_CAPI int32_t U_EXPORT2
1124	udat_formatForFields( const UDateFormat* format,
1125	UDate dateToFormat,
1126	UChar* result,
1127	int32_t resultLength,
1128	UFieldPositionIterator* fpositer,
1129	UErrorCode* status);
1130
1131	/**
1132	* Format a date using a UDateFormat.
1133	* The date will be formatted using the conventions specified in {@link #udat_open }
1134	* @param format
1135	* The formatter to use
1136	* @param calendar
1137	* The calendar to format. The calendar instance might be mutated if fields
1138	* are not yet fully calculated, though the function won't change the logical
1139	* date and time held by the instance.
1140	* @param result
1141	* A pointer to a buffer to receive the formatted number.
1142	* @param capacity
1143	* The maximum size of result.
1144	* @param fpositer
1145	* A pointer to a UFieldPositionIterator created by {@link #ufieldpositer_open}
1146	* (may be NULL if field position information is not needed). Any
1147	* iteration information already present in the UFieldPositionIterator
1148	* will be deleted, and the iterator will be reset to apply to the
1149	* fields in the formatted string created by this function call; the
1150	* field values provided by {@link #ufieldpositer_next} will be from the
1151	* UDateFormatField enum.
1152	* @param status
1153	* A pointer to a UErrorCode to receive any errors
1154	* @return
1155	* The total buffer size needed; if greater than resultLength, the output was truncated.
1156	* @see udat_format
1157	* @see udat_parseCalendar
1158	* @see UFieldPositionIterator
1159	* @stable ICU 55
1160	*/
1161	U_CAPI int32_t U_EXPORT2
1162	udat_formatCalendarForFields( const UDateFormat* format,
1163	UCalendar* calendar,
1164	UChar* result,
1165	int32_t capacity,
1166	UFieldPositionIterator* fpositer,
1167	UErrorCode* status);
1168
1169
1170	/**
1171	* Parse a string into an date/time using a UDateFormat.
1172	* The date will be parsed using the conventions specified in {@link #udat_open }.
1173	* <P>
1174	* Note that the normal date formats associated with some calendars - such
1175	* as the Chinese lunar calendar - do not specify enough fields to enable
1176	* dates to be parsed unambiguously. In the case of the Chinese lunar
1177	* calendar, while the year within the current 60-year cycle is specified,
1178	* the number of such cycles since the start date of the calendar (in the
1179	* UCAL_ERA field of the UCalendar object) is not normally part of the format,
1180	* and parsing may assume the wrong era. For cases such as this it is
1181	* recommended that clients parse using udat_parseCalendar with the UCalendar
1182	* passed in set to the current date, or to a date within the era/cycle that
1183	* should be assumed if absent in the format.
1184	*
1185	* @param format The formatter to use.
1186	* @param text The text to parse.
1187	* @param textLength The length of text, or -1 if null-terminated.
1188	* @param parsePos If not 0, on input a pointer to an integer specifying the offset at which
1189	* to begin parsing. If not 0, on output the offset at which parsing ended.
1190	* @param status A pointer to an UErrorCode to receive any errors
1191	* @return The value of the parsed date/time
1192	* @see udat_format
1193	* @stable ICU 2.0
1194	*/
1195	U_CAPI UDate U_EXPORT2
1196	udat_parse(const UDateFormat* format,
1197	const UChar* text,
1198	int32_t textLength,
1199	int32_t *parsePos,
1200	UErrorCode *status);
1201
1202	/**
1203	* Parse a string into an date/time using a UDateFormat.
1204	* The date will be parsed using the conventions specified in {@link #udat_open }.
1205	* @param format The formatter to use.
1206	* @param calendar A calendar set on input to the date and time to be used for
1207	* missing values in the date/time string being parsed, and set
1208	* on output to the parsed date/time. When the calendar type is
1209	* different from the internal calendar held by the UDateFormat
1210	* instance, the internal calendar will be cloned to a work
1211	* calendar set to the same milliseconds and time zone as this
1212	* calendar parameter, field values will be parsed based on the
1213	* work calendar, then the result (milliseconds and time zone)
1214	* will be set in this calendar.
1215	* @param text The text to parse.
1216	* @param textLength The length of text, or -1 if null-terminated.
1217	* @param parsePos If not 0, on input a pointer to an integer specifying the offset at which
1218	* to begin parsing. If not 0, on output the offset at which parsing ended.
1219	* @param status A pointer to an UErrorCode to receive any errors
1220	* @see udat_format
1221	* @stable ICU 2.0
1222	*/
1223	U_CAPI void U_EXPORT2
1224	udat_parseCalendar(const UDateFormat* format,
1225	UCalendar* calendar,
1226	const UChar* text,
1227	int32_t textLength,
1228	int32_t *parsePos,
1229	UErrorCode *status);
1230
1231	/**
1232	* Determine if an UDateFormat will perform lenient parsing.
1233	* With lenient parsing, the parser may use heuristics to interpret inputs that do not
1234	* precisely match the pattern. With strict parsing, inputs must match the pattern.
1235	* @param fmt The formatter to query
1236	* @return true if fmt is set to perform lenient parsing, false otherwise.
1237	* @see udat_setLenient
1238	* @stable ICU 2.0
1239	*/
1240	U_CAPI UBool U_EXPORT2
1241	udat_isLenient(const UDateFormat* fmt);
1242
1243	/**
1244	* Specify whether an UDateFormat will perform lenient parsing.
1245	* With lenient parsing, the parser may use heuristics to interpret inputs that do not
1246	* precisely match the pattern. With strict parsing, inputs must match the pattern.
1247	* @param fmt The formatter to set
1248	* @param isLenient true if fmt should perform lenient parsing, false otherwise.
1249	* @see dat_isLenient
1250	* @stable ICU 2.0
1251	*/
1252	U_CAPI void U_EXPORT2
1253	udat_setLenient( UDateFormat* fmt,
1254	UBool isLenient);
1255
1256	/**
1257	* Get the UCalendar associated with an UDateFormat.
1258	* A UDateFormat uses a UCalendar to convert a raw value to, for example,
1259	* the day of the week.
1260	* @param fmt The formatter to query.
1261	* @return A pointer to the UCalendar used by fmt.
1262	* @see udat_setCalendar
1263	* @stable ICU 2.0
1264	*/
1265	U_CAPI const UCalendar* U_EXPORT2
1266	udat_getCalendar(const UDateFormat* fmt);
1267
1268	/**
1269	* Set the UCalendar associated with an UDateFormat.
1270	* A UDateFormat uses a UCalendar to convert a raw value to, for example,
1271	* the day of the week.
1272	* @param fmt The formatter to set.
1273	* @param calendarToSet A pointer to an UCalendar to be used by fmt.
1274	* @see udat_setCalendar
1275	* @stable ICU 2.0
1276	*/
1277	U_CAPI void U_EXPORT2
1278	udat_setCalendar( UDateFormat* fmt,
1279	const UCalendar* calendarToSet);
1280
1281	/**
1282	* Get the UNumberFormat associated with an UDateFormat.
1283	* A UDateFormat uses a UNumberFormat to format numbers within a date,
1284	* for example the day number.
1285	* @param fmt The formatter to query.
1286	* @return A pointer to the UNumberFormat used by fmt to format numbers.
1287	* @see udat_setNumberFormat
1288	* @stable ICU 2.0
1289	*/
1290	U_CAPI const UNumberFormat* U_EXPORT2
1291	udat_getNumberFormat(const UDateFormat* fmt);
1292
1293	/**
1294	* Get the UNumberFormat for specific field associated with an UDateFormat.
1295	* For example: 'y' for year and 'M' for month
1296	* @param fmt The formatter to query.
1297	* @param field the field to query
1298	* @return A pointer to the UNumberFormat used by fmt to format field numbers.
1299	* @see udat_setNumberFormatForField
1300	* @stable ICU 54
1301	*/
1302	U_CAPI const UNumberFormat* U_EXPORT2
1303	udat_getNumberFormatForField(const UDateFormat* fmt, UChar field);
1304
1305	/**
1306	* Set the UNumberFormat for specific field associated with an UDateFormat.
1307	* It can be a single field like: "y"(year) or "M"(month)
1308	* It can be several field combined together: "yM"(year and month)
1309	* Note:
1310	* 1 symbol field is enough for multiple symbol field (so "y" will override "yy", "yyy")
1311	* If the field is not numeric, then override has no effect (like "MMM" will use abbreviation, not numerical field)
1312	*
1313	* @param fields the fields to set
1314	* @param fmt The formatter to set.
1315	* @param numberFormatToSet A pointer to the UNumberFormat to be used by fmt to format numbers.
1316	* @param status error code passed around (memory allocation or invalid fields)
1317	* @see udat_getNumberFormatForField
1318	* @stable ICU 54
1319	*/
1320	U_CAPI void U_EXPORT2
1321	udat_adoptNumberFormatForFields( UDateFormat* fmt,
1322	const UChar* fields,
1323	UNumberFormat* numberFormatToSet,
1324	UErrorCode* status);
1325	/**
1326	* Set the UNumberFormat associated with an UDateFormat.
1327	* A UDateFormat uses a UNumberFormat to format numbers within a date,
1328	* for example the day number.
1329	* This method also clears per field NumberFormat instances previously
1330	* set by {@see udat_setNumberFormatForField}
1331	* @param fmt The formatter to set.
1332	* @param numberFormatToSet A pointer to the UNumberFormat to be used by fmt to format numbers.
1333	* @see udat_getNumberFormat
1334	* @see udat_setNumberFormatForField
1335	* @stable ICU 2.0
1336	*/
1337	U_CAPI void U_EXPORT2
1338	udat_setNumberFormat( UDateFormat* fmt,
1339	const UNumberFormat* numberFormatToSet);
1340	/**
1341	* Adopt the UNumberFormat associated with an UDateFormat.
1342	* A UDateFormat uses a UNumberFormat to format numbers within a date,
1343	* for example the day number.
1344	* @param fmt The formatter to set.
1345	* @param numberFormatToAdopt A pointer to the UNumberFormat to be used by fmt to format numbers.
1346	* @see udat_getNumberFormat
1347	* @stable ICU 54
1348	*/
1349	U_CAPI void U_EXPORT2
1350	udat_adoptNumberFormat( UDateFormat* fmt,
1351	UNumberFormat* numberFormatToAdopt);
1352	/**
1353	* Get a locale for which date/time formatting patterns are available.
1354	* A UDateFormat in a locale returned by this function will perform the correct
1355	* formatting and parsing for the locale.
1356	* @param localeIndex The index of the desired locale.
1357	* @return A locale for which date/time formatting patterns are available, or 0 if none.
1358	* @see udat_countAvailable
1359	* @stable ICU 2.0
1360	*/
1361	U_CAPI const char* U_EXPORT2
1362	udat_getAvailable(int32_t localeIndex);
1363
1364	/**
1365	* Determine how many locales have date/time formatting patterns available.
1366	* This function is most useful as determining the loop ending condition for
1367	* calls to {@link #udat_getAvailable }.
1368	* @return The number of locales for which date/time formatting patterns are available.
1369	* @see udat_getAvailable
1370	* @stable ICU 2.0
1371	*/
1372	U_CAPI int32_t U_EXPORT2
1373	udat_countAvailable(void);
1374
1375	/**
1376	* Get the year relative to which all 2-digit years are interpreted.
1377	* For example, if the 2-digit start year is 2100, the year 99 will be
1378	* interpreted as 2199.
1379	* @param fmt The formatter to query.
1380	* @param status A pointer to an UErrorCode to receive any errors
1381	* @return The year relative to which all 2-digit years are interpreted.
1382	* @see udat_Set2DigitYearStart
1383	* @stable ICU 2.0
1384	*/
1385	U_CAPI UDate U_EXPORT2
1386	udat_get2DigitYearStart( const UDateFormat *fmt,
1387	UErrorCode *status);
1388
1389	/**
1390	* Set the year relative to which all 2-digit years will be interpreted.
1391	* For example, if the 2-digit start year is 2100, the year 99 will be
1392	* interpreted as 2199.
1393	* @param fmt The formatter to set.
1394	* @param d The year relative to which all 2-digit years will be interpreted.
1395	* @param status A pointer to an UErrorCode to receive any errors
1396	* @see udat_Set2DigitYearStart
1397	* @stable ICU 2.0
1398	*/
1399	U_CAPI void U_EXPORT2
1400	udat_set2DigitYearStart( UDateFormat *fmt,
1401	UDate d,
1402	UErrorCode *status);
1403
1404	/**
1405	* Extract the pattern from a UDateFormat.
1406	* The pattern will follow the pattern syntax rules.
1407	* @param fmt The formatter to query.
1408	* @param localized true if the pattern should be localized, false otherwise.
1409	* @param result A pointer to a buffer to receive the pattern.
1410	* @param resultLength The maximum size of result.
1411	* @param status A pointer to an UErrorCode to receive any errors
1412	* @return The total buffer size needed; if greater than resultLength, the output was truncated.
1413	* @see udat_applyPattern
1414	* @stable ICU 2.0
1415	*/
1416	U_CAPI int32_t U_EXPORT2
1417	udat_toPattern( const UDateFormat *fmt,
1418	UBool localized,
1419	UChar *result,
1420	int32_t resultLength,
1421	UErrorCode *status);
1422
1423	/**
1424	* Set the pattern used by an UDateFormat.
1425	* The pattern should follow the pattern syntax rules.
1426	* @param format The formatter to set.
1427	* @param localized true if the pattern is localized, false otherwise.
1428	* @param pattern The new pattern
1429	* @param patternLength The length of pattern, or -1 if null-terminated.
1430	* @see udat_toPattern
1431	* @stable ICU 2.0
1432	*/
1433	U_CAPI void U_EXPORT2
1434	udat_applyPattern( UDateFormat *format,
1435	UBool localized,
1436	const UChar *pattern,
1437	int32_t patternLength);
1438
1439	/**
1440	* The possible types of date format symbols
1441	* @stable ICU 2.6
1442	*/
1443	typedef enum UDateFormatSymbolType {
1444	/** The era names, for example AD */
1445	UDAT_ERAS,
1446	/** The month names, for example February */
1447	UDAT_MONTHS,
1448	/** The short month names, for example Feb. */
1449	UDAT_SHORT_MONTHS,
1450	/** The CLDR-style format "wide" weekday names, for example Monday */
1451	UDAT_WEEKDAYS,
1452	/**
1453	* The CLDR-style format "abbreviated" (not "short") weekday names, for example "Mon."
1454	* For the CLDR-style format "short" weekday names, use UDAT_SHORTER_WEEKDAYS.
1455	*/
1456	UDAT_SHORT_WEEKDAYS,
1457	/** The AM/PM names, for example AM */
1458	UDAT_AM_PMS,
1459	/** The localized characters */
1460	UDAT_LOCALIZED_CHARS,
1461	/** The long era names, for example Anno Domini */
1462	UDAT_ERA_NAMES,
1463	/** The narrow month names, for example F */
1464	UDAT_NARROW_MONTHS,
1465	/** The CLDR-style format "narrow" weekday names, for example "M" */
1466	UDAT_NARROW_WEEKDAYS,
1467	/** Standalone context versions of months */
1468	UDAT_STANDALONE_MONTHS,
1469	UDAT_STANDALONE_SHORT_MONTHS,
1470	UDAT_STANDALONE_NARROW_MONTHS,
1471	/** The CLDR-style stand-alone "wide" weekday names */
1472	UDAT_STANDALONE_WEEKDAYS,
1473	/**
1474	* The CLDR-style stand-alone "abbreviated" (not "short") weekday names.
1475	* For the CLDR-style stand-alone "short" weekday names, use UDAT_STANDALONE_SHORTER_WEEKDAYS.
1476	*/
1477	UDAT_STANDALONE_SHORT_WEEKDAYS,
1478	/** The CLDR-style stand-alone "narrow" weekday names */
1479	UDAT_STANDALONE_NARROW_WEEKDAYS,
1480	/** The quarters, for example 1st Quarter */
1481	UDAT_QUARTERS,
1482	/** The short quarter names, for example Q1 */
1483	UDAT_SHORT_QUARTERS,
1484	/** Standalone context versions of quarters */
1485	UDAT_STANDALONE_QUARTERS,
1486	UDAT_STANDALONE_SHORT_QUARTERS,
1487	/**
1488	* The CLDR-style short weekday names, e.g. "Su", Mo", etc.
1489	* These are named "SHORTER" to contrast with the constants using _SHORT_
1490	* above, which actually get the CLDR-style *abbreviated* versions of the
1491	* corresponding names.
1492	* @stable ICU 51
1493	*/
1494	UDAT_SHORTER_WEEKDAYS,
1495	/**
1496	* Standalone version of UDAT_SHORTER_WEEKDAYS.
1497	* @stable ICU 51
1498	*/
1499	UDAT_STANDALONE_SHORTER_WEEKDAYS,
1500	/**
1501	* Cyclic year names (only supported for some calendars, and only for FORMAT usage;
1502	* udat_setSymbols not supported for UDAT_CYCLIC_YEARS_WIDE)
1503	* @stable ICU 54
1504	*/
1505	UDAT_CYCLIC_YEARS_WIDE,
1506	/**
1507	* Cyclic year names (only supported for some calendars, and only for FORMAT usage)
1508	* @stable ICU 54
1509	*/
1510	UDAT_CYCLIC_YEARS_ABBREVIATED,
1511	/**
1512	* Cyclic year names (only supported for some calendars, and only for FORMAT usage;
1513	* udat_setSymbols not supported for UDAT_CYCLIC_YEARS_NARROW)
1514	* @stable ICU 54
1515	*/
1516	UDAT_CYCLIC_YEARS_NARROW,
1517	/**
1518	* Calendar zodiac names (only supported for some calendars, and only for FORMAT usage;
1519	* udat_setSymbols not supported for UDAT_ZODIAC_NAMES_WIDE)
1520	* @stable ICU 54
1521	*/
1522	UDAT_ZODIAC_NAMES_WIDE,
1523	/**
1524	* Calendar zodiac names (only supported for some calendars, and only for FORMAT usage)
1525	* @stable ICU 54
1526	*/
1527	UDAT_ZODIAC_NAMES_ABBREVIATED,
1528	/**
1529	* Calendar zodiac names (only supported for some calendars, and only for FORMAT usage;
1530	* udat_setSymbols not supported for UDAT_ZODIAC_NAMES_NARROW)
1531	* @stable ICU 54
1532	*/
1533	UDAT_ZODIAC_NAMES_NARROW,
1534
1535	#ifndef U_HIDE_DRAFT_API
1536	/**
1537	* The narrow quarter names, for example 1
1538	* @draft ICU 70
1539	*/
1540	UDAT_NARROW_QUARTERS,
1541
1542	/**
1543	* The narrow standalone quarter names, for example 1
1544	* @draft ICU 70
1545	*/
1546	UDAT_STANDALONE_NARROW_QUARTERS
1547	#endif // U_HIDE_DRAFT_API
1548	} UDateFormatSymbolType;
1549
1550	struct UDateFormatSymbols;
1551	/** Date format symbols.
1552	* For usage in C programs.
1553	* @stable ICU 2.6
1554	*/
1555	typedef struct UDateFormatSymbols UDateFormatSymbols;
1556
1557	/**
1558	* Get the symbols associated with an UDateFormat.
1559	* The symbols are what a UDateFormat uses to represent locale-specific data,
1560	* for example month or day names.
1561	* @param fmt The formatter to query.
1562	* @param type The type of symbols to get. One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
1563	* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
1564	* @param symbolIndex The desired symbol of type type.
1565	* @param result A pointer to a buffer to receive the pattern.
1566	* @param resultLength The maximum size of result.
1567	* @param status A pointer to an UErrorCode to receive any errors
1568	* @return The total buffer size needed; if greater than resultLength, the output was truncated.
1569	* @see udat_countSymbols
1570	* @see udat_setSymbols
1571	* @stable ICU 2.0
1572	*/
1573	U_CAPI int32_t U_EXPORT2
1574	udat_getSymbols(const UDateFormat *fmt,
1575	UDateFormatSymbolType type,
1576	int32_t symbolIndex,
1577	UChar *result,
1578	int32_t resultLength,
1579	UErrorCode *status);
1580
1581	/**
1582	* Count the number of particular symbols for an UDateFormat.
1583	* This function is most useful as for determining the loop termination condition
1584	* for calls to {@link #udat_getSymbols }.
1585	* @param fmt The formatter to query.
1586	* @param type The type of symbols to count. One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
1587	* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
1588	* @return The number of symbols of type type.
1589	* @see udat_getSymbols
1590	* @see udat_setSymbols
1591	* @stable ICU 2.0
1592	*/
1593	U_CAPI int32_t U_EXPORT2
1594	udat_countSymbols( const UDateFormat *fmt,
1595	UDateFormatSymbolType type);
1596
1597	/**
1598	* Set the symbols associated with an UDateFormat.
1599	* The symbols are what a UDateFormat uses to represent locale-specific data,
1600	* for example month or day names.
1601	* @param format The formatter to set
1602	* @param type The type of symbols to set. One of UDAT_ERAS, UDAT_MONTHS, UDAT_SHORT_MONTHS,
1603	* UDAT_WEEKDAYS, UDAT_SHORT_WEEKDAYS, UDAT_AM_PMS, or UDAT_LOCALIZED_CHARS
1604	* @param symbolIndex The index of the symbol to set of type type.
1605	* @param value The new value
1606	* @param valueLength The length of value, or -1 if null-terminated
1607	* @param status A pointer to an UErrorCode to receive any errors
1608	* @see udat_getSymbols
1609	* @see udat_countSymbols
1610	* @stable ICU 2.0
1611	*/
1612	U_CAPI void U_EXPORT2
1613	udat_setSymbols( UDateFormat *format,
1614	UDateFormatSymbolType type,
1615	int32_t symbolIndex,
1616	UChar *value,
1617	int32_t valueLength,
1618	UErrorCode *status);
1619
1620	/**
1621	* Get the locale for this date format object.
1622	* You can choose between valid and actual locale.
1623	* @param fmt The formatter to get the locale from
1624	* @param type type of the locale we're looking for (valid or actual)
1625	* @param status error code for the operation
1626	* @return the locale name
1627	* @stable ICU 2.8
1628	*/
1629	U_CAPI const char* U_EXPORT2
1630	udat_getLocaleByType(const UDateFormat *fmt,
1631	ULocDataLocaleType type,
1632	UErrorCode* status);
1633
1634	/**
1635	* Set a particular UDisplayContext value in the formatter, such as
1636	* UDISPCTX_CAPITALIZATION_FOR_STANDALONE.
1637	* @param fmt The formatter for which to set a UDisplayContext value.
1638	* @param value The UDisplayContext value to set.
1639	* @param status A pointer to an UErrorCode to receive any errors
1640	* @stable ICU 51
1641	*/
1642	U_CAPI void U_EXPORT2
1643	udat_setContext(UDateFormat* fmt, UDisplayContext value, UErrorCode* status);
1644
1645	/**
1646	* Get the formatter's UDisplayContext value for the specified UDisplayContextType,
1647	* such as UDISPCTX_TYPE_CAPITALIZATION.
1648	* @param fmt The formatter to query.
1649	* @param type The UDisplayContextType whose value to return
1650	* @param status A pointer to an UErrorCode to receive any errors
1651	* @return The UDisplayContextValue for the specified type.
1652	* @stable ICU 53
1653	*/
1654	U_CAPI UDisplayContext U_EXPORT2
1655	udat_getContext(const UDateFormat* fmt, UDisplayContextType type, UErrorCode* status);
1656
1657	#ifndef U_HIDE_INTERNAL_API
1658	/**
1659	* Extract the date pattern from a UDateFormat set for relative date formatting.
1660	* The pattern will follow the pattern syntax rules.
1661	* @param fmt The formatter to query.
1662	* @param result A pointer to a buffer to receive the pattern.
1663	* @param resultLength The maximum size of result.
1664	* @param status A pointer to a UErrorCode to receive any errors
1665	* @return The total buffer size needed; if greater than resultLength, the output was truncated.
1666	* @see udat_applyPatternRelative
1667	* @internal ICU 4.2 technology preview
1668	*/
1669	U_CAPI int32_t U_EXPORT2
1670	udat_toPatternRelativeDate(const UDateFormat *fmt,
1671	UChar *result,
1672	int32_t resultLength,
1673	UErrorCode *status);
1674
1675	/**
1676	* Extract the time pattern from a UDateFormat set for relative date formatting.
1677	* The pattern will follow the pattern syntax rules.
1678	* @param fmt The formatter to query.
1679	* @param result A pointer to a buffer to receive the pattern.
1680	* @param resultLength The maximum size of result.
1681	* @param status A pointer to a UErrorCode to receive any errors
1682	* @return The total buffer size needed; if greater than resultLength, the output was truncated.
1683	* @see udat_applyPatternRelative
1684	* @internal ICU 4.2 technology preview
1685	*/
1686	U_CAPI int32_t U_EXPORT2
1687	udat_toPatternRelativeTime(const UDateFormat *fmt,
1688	UChar *result,
1689	int32_t resultLength,
1690	UErrorCode *status);
1691
1692	/**
1693	* Set the date & time patterns used by a UDateFormat set for relative date formatting.
1694	* The patterns should follow the pattern syntax rules.
1695	* @param format The formatter to set.
1696	* @param datePattern The new date pattern
1697	* @param datePatternLength The length of datePattern, or -1 if null-terminated.
1698	* @param timePattern The new time pattern
1699	* @param timePatternLength The length of timePattern, or -1 if null-terminated.
1700	* @param status A pointer to a UErrorCode to receive any errors
1701	* @see udat_toPatternRelativeDate, udat_toPatternRelativeTime
1702	* @internal ICU 4.2 technology preview
1703	*/
1704	U_CAPI void U_EXPORT2
1705	udat_applyPatternRelative(UDateFormat *format,
1706	const UChar *datePattern,
1707	int32_t datePatternLength,
1708	const UChar *timePattern,
1709	int32_t timePatternLength,
1710	UErrorCode *status);
1711
1712	/**
1713	* @internal
1714	* @see udat_open
1715	*/
1716	typedef UDateFormat* (U_EXPORT2 *UDateFormatOpener) (UDateFormatStyle timeStyle,
1717	UDateFormatStyle dateStyle,
1718	const char *locale,
1719	const UChar *tzID,
1720	int32_t tzIDLength,
1721	const UChar *pattern,
1722	int32_t patternLength,
1723	UErrorCode *status);
1724
1725	/**
1726	* Register a provider factory
1727	* @internal ICU 49
1728	*/
1729	U_CAPI void U_EXPORT2
1730	udat_registerOpener(UDateFormatOpener opener, UErrorCode *status);
1731
1732	/**
1733	* Un-Register a provider factory
1734	* @internal ICU 49
1735	*/
1736	U_CAPI UDateFormatOpener U_EXPORT2
1737	udat_unregisterOpener(UDateFormatOpener opener, UErrorCode *status);
1738	#endif /* U_HIDE_INTERNAL_API */
1739
1740
1741	#endif /* #if !UCONFIG_NO_FORMATTING */
1742
1743	#endif
1744