/* GNU Mailutils -- a suite of utilities for electronic mail Copyright (C) 2011-2012, 2014-2017 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/>. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <stdlib.h> #include <mailutils/datetime.h> int 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; }