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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2025 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>
#define TMSEC(t) \
((t).tm_mday * 86400 + (t).tm_hour * 3600 + (t).tm_min * 60 + (t).tm_sec)
/* Returns the offset of our timezone from UTC, in seconds. */
int
mu_utc_offset (void)
{
time_t t = time (NULL);
struct tm ltm = *localtime (&t);
struct tm gtm = *gmtime (&t);
if (gtm.tm_mday == 1 && ltm.tm_mday > 2)
ltm.tm_mday = 0;
else if (ltm.tm_mday == 1 && gtm.tm_mday > 2)
gtm.tm_mday = 0;
return TMSEC (ltm) - TMSEC (gtm);
}
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