timegm.c

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#include "config.h"
#include <stdbool.h>
#include <time.h>

static bool is_leap_year(int year)
{
  return ((year % 400) == 0) || (((year % 4) == 0) && ((year % 100) != 0));
}

static time_t tm_to_sec(struct tm *tm)
{
  time_t val = tm->tm_sec + (tm->tm_min * 60) + (tm->tm_hour * 3600) + (tm->tm_yday * 86400);
 
  int year = 1900 + tm->tm_year;
  for (int i = 1970; i < year; i++)
  {
    if (is_leap_year(i))
      val += (366 * 86400);
    else
      val += (365 * 86400);
  }
 
  return val;
}

time_t timegm(struct tm *tm)
{
  return tm_to_sec(tm);
}