1 | /* date.h |
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2 | * Routines for date handling |
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3 | * Copyright (C) 2010,2015,2018 Olly Betts |
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4 | * |
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5 | * This program is free software; you can redistribute it and/or modify |
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6 | * it under the terms of the GNU General Public License as published by |
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7 | * the Free Software Foundation; either version 2 of the License, or |
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8 | * (at your option) any later version. |
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9 | * |
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10 | * This program is distributed in the hope that it will be useful, |
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11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 | * GNU General Public License for more details. |
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14 | * |
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15 | * You should have received a copy of the GNU General Public License |
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16 | * along with this program; if not, write to the Free Software |
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17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 | */ |
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19 | |
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20 | #ifdef __cplusplus |
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21 | extern "C" { |
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22 | #endif |
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23 | |
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24 | extern int is_leap_year(int year); |
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25 | |
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26 | /* Return last day for given month of given year. */ |
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27 | unsigned int last_day(int year, int month); |
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28 | |
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29 | int days_since_1900(int y, int m, int d); |
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30 | |
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31 | void ymd_from_days_since_1900(int days, int * py, int * pm, int * pd); |
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32 | |
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33 | double julian_date_from_days_since_1900(int days); |
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34 | |
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35 | #ifdef __cplusplus |
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36 | } |
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37 | #endif |
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