/* GNU Mailutils -- a suite of utilities for electronic mail Copyright (C) 1999-2001, 2007, 2009-2012, 2014-2016 Free Software Foundation, Inc. GNU Mailutils is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GNU Mailutils 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 General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <time.h> #include <mailutils/datetime.h> #define SECS_PER_DAY 86400 #define JD_OF_EPOCH 2440588 /* Convert struct tm into UTC. */ time_t mu_datetime_to_utc (struct tm *tm, struct mu_timezone *tz) { int jd = mu_datetime_julianday (tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday); return (jd - JD_OF_EPOCH) * SECS_PER_DAY + (tm->tm_hour * 60 + tm->tm_min) * 60 + tm->tm_sec - (tz ? tz->utc_offset : 0); }