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/* Copyright (c) 2002-2018 Dovecot authors, see the included COPYING file */
#include "lib.h"
#include "utc-offset.h"
#include <sys/time.h>
int utc_offset(struct tm *tm, time_t t ATTR_UNUSED)
{
#ifdef HAVE_TM_GMTOFF
return (int) (tm->tm_gmtoff/60);
#else
struct tm ltm, gtm;
int offset;
/* gmtime() overwrites tm, so we need to copy it elsewhere */
ltm = *tm;
tm = gmtime(&t);
gtm = *tm;
/* max offset of 24 hours */
if ((ltm.tm_yday < gtm.tm_yday && ltm.tm_year == gtm.tm_year) ||
ltm.tm_year < gtm.tm_year)
offset = -24 * 60;
else if ((ltm.tm_yday > gtm.tm_yday && ltm.tm_year == gtm.tm_year) ||
ltm.tm_year > gtm.tm_year)
offset = 24 * 60;
else
offset = 0;
offset += (ltm.tm_hour - gtm.tm_hour) * 60;
offset += (ltm.tm_min - gtm.tm_min);
/* restore overwritten tm */
*tm = ltm;
return offset;
#endif
}
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