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 
15 namespace boost {
16 namespace 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
local_day()30     static date_type local_day()
31     {
32       return date_type(local_day_ymd());
33     }
34     //! Get the local day as a ymd_type
local_day_ymd()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
universal_day_ymd()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
universal_day()53     static date_type universal_day()
54     {
55       return date_type(universal_day_ymd());
56     }
57 
58   private:
get_local_time(std::tm & result)59     static ::std::tm* get_local_time(std::tm& result)
60     {
61       ::std::time_t t;
62       ::std::time(&t);
63       return c_time::localtime(&t, &result);
64     }
get_universal_time(std::tm & result)65     static ::std::tm* get_universal_time(std::tm& result)
66     {
67       ::std::time_t t;
68       ::std::time(&t);
69       return c_time::gmtime(&t, &result);
70     }
71 
72   };
73 
74 } } //namespace date_time
75 
76 
77 #endif
78