Function fresh_tzdata

localtime.c:1826–1836

Return true if primary cached time zone data are fresh, i.e., if this function is known to have recently returned false. A call is recent if it occurred less than tz_change_interval seconds ago. NOW should be the current time. */

   A call is recent if it occurred less than tz_change_interval seconds ago.
   NOW should be the current time.  */
static bool
fresh_tzdata(monotime_t now)
{
  /* If nonzero, the time of the last false return.  */
  static monotime_t last_checked;

  if (last_checked && now - last_checked < tz_change_interval)
    return true;
  last_checked = now;
  return false;
}

/* Initialize *SP to a value appropriate for the TZ setting NAME.
   Respect TZLOADFLAGS.