1 | #ifndef _GREGORIAN__CONVERSION_HPP___ |
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2 | #define _GREGORIAN__CONVERSION_HPP___ |
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3 | |
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4 | /* Copyright (c) 2004-2005 CrystalClear Software, Inc. |
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5 | * Use, modification and distribution is subject to the |
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6 | * Boost Software License, Version 1.0. (See accompanying |
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7 | * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt) |
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8 | * Author: Jeff Garland, Bart Garst |
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9 | * $Date: 2010-06-09 14:10:13 -0400 (Wed, 09 Jun 2010) $ |
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10 | */ |
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11 | |
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12 | #include <cstring> |
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13 | #include <string> |
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14 | #include <stdexcept> |
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15 | #include <boost/throw_exception.hpp> |
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16 | #include <boost/date_time/c_time.hpp> |
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17 | #include <boost/date_time/special_defs.hpp> |
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18 | #include <boost/date_time/gregorian/gregorian_types.hpp> |
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19 | |
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20 | namespace boost { |
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21 | |
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22 | namespace gregorian { |
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23 | |
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24 | //! Converts a date to a tm struct. Throws out_of_range exception if date is a special value |
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25 | inline |
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26 | std::tm to_tm(const date& d) |
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27 | { |
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28 | if (d.is_special()) |
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29 | { |
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30 | std::string s = "tm unable to handle "; |
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31 | switch (d.as_special()) |
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32 | { |
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33 | case date_time::not_a_date_time: |
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34 | s += "not-a-date-time value"; break; |
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35 | case date_time::neg_infin: |
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36 | s += "-infinity date value"; break; |
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37 | case date_time::pos_infin: |
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38 | s += "+infinity date value"; break; |
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39 | default: |
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40 | s += "a special date value"; break; |
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41 | } |
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42 | boost::throw_exception(std::out_of_range(s)); |
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43 | } |
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44 | |
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45 | std::tm datetm; |
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46 | std::memset(&datetm, 0, sizeof(datetm)); |
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47 | boost::gregorian::date::ymd_type ymd = d.year_month_day(); |
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48 | datetm.tm_year = ymd.year - 1900; |
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49 | datetm.tm_mon = ymd.month - 1; |
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50 | datetm.tm_mday = ymd.day; |
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51 | datetm.tm_wday = d.day_of_week(); |
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52 | datetm.tm_yday = d.day_of_year() - 1; |
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53 | datetm.tm_isdst = -1; // negative because not enough info to set tm_isdst |
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54 | return datetm; |
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55 | } |
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56 | |
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57 | //! Converts a tm structure into a date dropping the any time values. |
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58 | inline |
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59 | date date_from_tm(const std::tm& datetm) |
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60 | { |
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61 | return date(static_cast<unsigned short>(datetm.tm_year+1900), |
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62 | static_cast<unsigned short>(datetm.tm_mon+1), |
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63 | static_cast<unsigned short>(datetm.tm_mday)); |
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64 | } |
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65 | |
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66 | } } //namespace boost::gregorian |
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67 | |
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68 | #endif |
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