ref: b95034ed959dbc24a91df409a35ae8282ba15cdd
dir: /src/libc/time/gmtime.c/
#include <time.h>
#include "../libc.h"
#undef gmtime
struct tm *
gmtime(const time_t *t)
{
static struct tm tm;
time_t sec, min, hour, year, day;
int i;
tm.tm_sec = *t % SECDAY;
tm.tm_min = tm.tm_sec / 60;
tm.tm_sec %= 60;
tm.tm_hour = tm.tm_min / 60;
tm.tm_min %= 60;
day = *t / SECDAY;
tm.tm_wday = (day + THU) % 7; /* 1/1/1970 was Thursday */
for (i = EPOCH; day >= _daysyear(i); ++i)
day -= _daysyear(i);
tm.tm_year = i - 1900;
tm.tm_yday = day;
_daysmon[FEB] = FEBDAYS(tm.tm_year);
for (i = JAN; day > _daysmon[i]; i++)
day -= _daysmon[i];
tm.tm_mon = i;
tm.tm_mday = day + 1;
tm.tm_isdst = 0;
return &tm;
}