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/* Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
*/
#include <sys/types.h>
#ifdef SYSV
#include <time.h>
#else
#include <sys/time.h>
#include <sys/timeb.h>
#endif
#ifdef MACOSX
#include <time.h>
#endif
#define SECONDS_1970_TO_1980 315532800L
static long get_timezone();
/* GMT_TO_LST -- Convert gmt to local standard time, epoch 1980.
*/
time_t
gmt_to_lst (gmt)
time_t gmt;
{
struct tm *localtime();
time_t time_var;
long gmtl;
/* Subtract seconds westward from GMT */
time_var = gmt - get_timezone();
/* Correct for daylight savings time, if in effect */
gmtl = (long)gmt;
#ifndef MACOSX
/* Mac systems already include the DST offset in the GMT offset */
if (localtime(&gmtl)->tm_isdst)
time_var += 60L * 60L;
#endif
return (time_var - SECONDS_1970_TO_1980);
}
/* _TIMEZONE -- Get the local timezone, measured in seconds westward
* from Greenwich, ignoring daylight savings time if in effect.
*/
static long
get_timezone()
{
#ifdef CYGWIN
extern long _timezone;
tzset();
return (_timezone);
#else
#ifdef SYSV
extern long timezone;
tzset();
return (timezone);
#else
#ifdef MACOSX
struct tm *tm;
time_t clock = time(NULL);
tm = localtime (&clock);
return (-(tm->tm_gmtoff));
#else
struct timeb time_info;
ftime (&time_info);
return (time_info.timezone * 60);
#endif
#endif
#endif
}
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