Diffstat (limited to 'libmailutils/datetime/jd.c')
1 files changed, 32 insertions, 0 deletions
diff --git a/libmailutils/datetime/jd.c b/libmailutils/datetime/jd.c
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+/* GNU Mailutils -- a suite of utilities for electronic mail
+ Copyright (C) 2011 Free Software Foundation, Inc.
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 3 of the License, or (at your option) any later version.
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General
+ Public License along with this library. If not, see
+ <http://www.gnu.org/licenses/>. */
+# include <config.h>
+mu_datetime_julianday (int year, int month, int day)
+ int a = (14 - month) / 12;
+ int y = year + 4800 - a;
+ int m = month + 12*a - 3;
+ return day + (153*m + 2)/5 + 365*y + y/4 - y/100 + y/400 - 32045;