35 lines
866 B
C
Executable File
35 lines
866 B
C
Executable File
/*
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* localtime - convert a calendar time into broken down time
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*/
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/* $Header$ */
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#include <time.h>
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#include "loc_time.h"
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/* We must be careful, since an int can't represent all the seconds in a day.
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* Hence the adjustment of minutes when adding timezone and dst information.
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* This assumes that both must be expressable in multiples of a minute.
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* Furthermore, it is assumed that both fit into an integer when expressed as
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* minutes (this is about 22 days, so this should not cause any problems).
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*/
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struct tm *
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localtime(const time_t *timer)
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{
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struct tm *timep;
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unsigned dst;
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_tzset();
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timep = gmtime(timer); /* tm->tm_isdst == 0 */
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timep->tm_min -= _timezone / 60;
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timep->tm_sec -= _timezone % 60;
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mktime(timep);
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dst = _dstget(timep);
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if (dst) {
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timep->tm_min += dst / 60;
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timep->tm_sec += dst % 60;
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mktime(timep);
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}
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return timep;
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}
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