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1 | #ifndef _GREGORIAN__CONVERSION_HPP___ |
2 | #define _GREGORIAN__CONVERSION_HPP___ | |
3 | ||
4 | /* Copyright (c) 2004-2005 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 <cstring> | |
13 | #include <string> | |
14 | #include <stdexcept> | |
15 | #include <boost/throw_exception.hpp> | |
16 | #include <boost/date_time/c_time.hpp> | |
17 | #include <boost/date_time/special_defs.hpp> | |
18 | #include <boost/date_time/gregorian/gregorian_types.hpp> | |
19 | ||
20 | namespace boost { | |
21 | ||
22 | namespace gregorian { | |
23 | ||
24 | //! Converts a date to a tm struct. Throws out_of_range exception if date is a special value | |
25 | inline | |
26 | std::tm to_tm(const date& d) | |
27 | { | |
28 | if (d.is_special()) | |
29 | { | |
30 | std::string s = "tm unable to handle "; | |
31 | switch (d.as_special()) | |
32 | { | |
33 | case date_time::not_a_date_time: | |
34 | s += "not-a-date-time value"; break; | |
35 | case date_time::neg_infin: | |
36 | s += "-infinity date value"; break; | |
37 | case date_time::pos_infin: | |
38 | s += "+infinity date value"; break; | |
39 | default: | |
40 | s += "a special date value"; break; | |
41 | } | |
42 | boost::throw_exception(std::out_of_range(s)); | |
43 | } | |
44 | ||
45 | std::tm datetm; | |
46 | std::memset(&datetm, 0, sizeof(datetm)); | |
47 | boost::gregorian::date::ymd_type ymd = d.year_month_day(); | |
48 | datetm.tm_year = ymd.year - 1900; | |
49 | datetm.tm_mon = ymd.month - 1; | |
50 | datetm.tm_mday = ymd.day; | |
51 | datetm.tm_wday = d.day_of_week(); | |
52 | datetm.tm_yday = d.day_of_year() - 1; | |
53 | datetm.tm_isdst = -1; // negative because not enough info to set tm_isdst | |
54 | return datetm; | |
55 | } | |
56 | ||
57 | //! Converts a tm structure into a date dropping the any time values. | |
58 | inline | |
59 | date date_from_tm(const std::tm& datetm) | |
60 | { | |
61 | return date(static_cast<unsigned short>(datetm.tm_year+1900), | |
62 | static_cast<unsigned short>(datetm.tm_mon+1), | |
63 | static_cast<unsigned short>(datetm.tm_mday)); | |
64 | } | |
65 | ||
66 | } } //namespace boost::gregorian | |
67 | ||
68 | #endif |