1#ifndef DATE_CLOCK_DEVICE_HPP___
2#define DATE_CLOCK_DEVICE_HPP___
3
4/* Copyright (c) 2002,2003,2005 CrystalClear Software, Inc.
5 * Use, modification and distribution is subject to the
6 * Boost Software License, Version 1.0. (See accompanying
7 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
8 * Author: Jeff Garland, Bart Garst
9 * $Date$
10 */
11
12#include "boost/date_time/c_time.hpp"
13
14
15namespace boost {
16namespace date_time {
17
18 //! A clock providing day level services based on C time_t capabilities
19 /*! This clock uses Posix interfaces as its implementation and hence
20 * uses the timezone settings of the operating system. Incorrect
21 * user settings will result in incorrect results for the calls
22 * to local_day.
23 */
24 template<class date_type>
25 class day_clock
26 {
27 public:
28 typedef typename date_type::ymd_type ymd_type;
29 //! Get the local day as a date type
30 static date_type local_day()
31 {
32 return date_type(local_day_ymd());
33 }
34 //! Get the local day as a ymd_type
35 static typename date_type::ymd_type local_day_ymd()
36 {
37 ::std::tm result;
38 ::std::tm* curr = get_local_time(result);
39 return ymd_type(static_cast<unsigned short>(curr->tm_year + 1900),
40 static_cast<unsigned short>(curr->tm_mon + 1),
41 static_cast<unsigned short>(curr->tm_mday));
42 }
43 //! Get the current day in universal date as a ymd_type
44 static typename date_type::ymd_type universal_day_ymd()
45 {
46 ::std::tm result;
47 ::std::tm* curr = get_universal_time(result);
48 return ymd_type(static_cast<unsigned short>(curr->tm_year + 1900),
49 static_cast<unsigned short>(curr->tm_mon + 1),
50 static_cast<unsigned short>(curr->tm_mday));
51 }
52 //! Get the UTC day as a date type
53 static date_type universal_day()
54 {
55 return date_type(universal_day_ymd());
56 }
57
58 private:
59 static ::std::tm* get_local_time(std::tm& result)
60 {
61 ::std::time_t t;
62 ::std::time(timer: &t);
63 return c_time::localtime(t: &t, result: &result);
64 }
65 static ::std::tm* get_universal_time(std::tm& result)
66 {
67 ::std::time_t t;
68 ::std::time(timer: &t);
69 return c_time::gmtime(t: &t, result: &result);
70 }
71
72 };
73
74} } //namespace date_time
75
76
77#endif
78

source code of include/boost/date_time/date_clock_device.hpp