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#include <time.h>
struct tm *gmtime_r(const time_t *timer, struct tm *result)
{
time_t t = *timer;
int days, rem;
int year, month;
rem = t % 86400;
days = t / 86400;
if (rem < 0) {
rem += 86400;
days--;
}
result->tm_hour = rem / 3600;
rem %= 3600;
result->tm_min = rem / 60;
result->tm_sec = rem % 60;
result->tm_isdst = 0;
result->tm_wday = (4 + days) % 7;
if (result->tm_wday < 0)
result->tm_wday += 7;
long z = days + 719468;
long era = (z >= 0 ? z : z - 146096) / 146097;
long day_of_era = z - era * 146097;
long yoe = (day_of_era - day_of_era / 1460 + day_of_era / 36524 -
day_of_era / 146096) /
365;
year = (int)(yoe + era * 400);
long doy = day_of_era - (365 * yoe + yoe / 4 - yoe / 100);
result->tm_yday = (int)doy;
int mp = (5 * doy + 2) / 153;
result->tm_mday = (int)(doy - (153 * mp + 2) / 5 + 1);
result->tm_mon = (mp + 2) % 12;
result->tm_year = year - 1900 + (mp / 10);
return result;
}
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