module time // portable_timegm does the same as C._mkgmtime, but unlike it, // can work with dates before the Unix epoch of 1970-01-01 . pub fn portable_timegm(t &C.tm) i64 { mut year := t.tm_year + 1900 mut month := t.tm_mon // 0-11 if month > 11 { year += month / 12 month %= 12 } else if month < 0 { years_diff := (11 - month) / 12 year -= years_diff month += 12 * years_diff } days_since_1970 := i64(days_from_unix_epoch(year, month + 1, t.tm_mday)) return 60 * (60 * (24 * days_since_1970 + t.tm_hour) + t.tm_min) + t.tm_sec }