1// Copyright © SixtyFPS GmbH <info@slint.dev>
2// SPDX-License-Identifier: GPL-3.0-only OR LicenseRef-Slint-Royalty-free-2.0 OR LicenseRef-Slint-Software-3.0
3
4use crate::SharedString;
5#[cfg(feature = "std")]
6use chrono::Local;
7use chrono::{Datelike, NaiveDate};
8
9pub fn use_24_hour_format() -> bool {
10 true
11}
12
13/// Returns the number of days in a given month
14pub fn month_day_count(month: u32, year: i32) -> Option<i32> {
15 Some(
16 NaiveDateTimeDelta::from_ymd_opt(
17 year:match month {
18 12 => year + 1,
19 _ => year,
20 },
21 month:match month {
22 12 => 1,
23 _ => month + 1,
24 },
25 day:1,
26 )?
27 .signed_duration_since(NaiveDate::from_ymd_opt(year, month, day:1)?)
28 .num_days() as i32,
29 )
30}
31
32pub fn month_offset(month: u32, year: i32) -> i32 {
33 if let Some(date: NaiveDate) = NaiveDate::from_ymd_opt(year, month, day:1) {
34 let offset: i32 = date.weekday().number_from_monday() as i32;
35
36 // sunday
37 if offset >= 7 {
38 return 0;
39 }
40
41 return offset;
42 }
43
44 // The result is only None if month == 0, it should not happen because the function is only
45 // used internal and not directly by the user. So it is ok to return 0 on a None result
46 0
47}
48
49pub fn format_date(format: &str, day: u32, month: u32, year: i32) -> SharedString {
50 if let Some(date: NaiveDate) = NaiveDate::from_ymd_opt(year, month, day) {
51 return crate::format!("{}", date.format(format));
52 }
53
54 // Don't panic, this function is used only internal
55 SharedString::default()
56}
57
58pub fn parse_date(date: &str, format: &str) -> Option<[i32; 3]> {
59 NaiveDateOption::parse_from_str(s:date, fmt:format)
60 .ok()
61 .map(|date: NaiveDate| [date.day() as i32, date.month() as i32, date.year()])
62}
63
64#[cfg(feature = "std")]
65pub fn date_now() -> [i32; 3] {
66 let now: NaiveDate = Local::now().date_naive();
67 [now.day() as i32, now.month() as i32, now.year()]
68}
69
70// display the today date is currently not implemented for no_std
71#[cfg(not(feature = "std"))]
72pub fn date_now() -> [i32; 3] {
73 [-1, -1, -1]
74}
75
76#[cfg(feature = "ffi")]
77mod ffi {
78 #![allow(unsafe_code)]
79
80 use super::*;
81
82 #[no_mangle]
83 pub extern "C" fn slint_date_time_use_24_hour_format() -> bool {
84 use_24_hour_format()
85 }
86
87 #[no_mangle]
88 pub extern "C" fn slint_date_time_month_day_count(month: u32, year: i32) -> i32 {
89 month_day_count(month, year).unwrap_or(0)
90 }
91
92 #[no_mangle]
93 pub extern "C" fn slint_date_time_month_offset(month: u32, year: i32) -> i32 {
94 month_offset(month, year)
95 }
96
97 #[no_mangle]
98 pub extern "C" fn slint_date_time_format_date(
99 format: &SharedString,
100 day: u32,
101 month: u32,
102 year: i32,
103 out: &mut SharedString,
104 ) {
105 *out = format_date(format, day, month, year)
106 }
107
108 #[no_mangle]
109 pub extern "C" fn slint_date_time_date_now(d: &mut i32, m: &mut i32, y: &mut i32) {
110 [*d, *m, *y] = date_now();
111 }
112
113 #[no_mangle]
114 pub extern "C" fn slint_date_time_parse_date(
115 date: &SharedString,
116 format: &SharedString,
117 d: &mut i32,
118 m: &mut i32,
119 y: &mut i32,
120 ) -> bool {
121 if let Some(x) = parse_date(date, format) {
122 [*d, *m, *y] = x;
123 true
124 } else {
125 false
126 }
127 }
128}
129