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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_civil(year, month + 1, t.tm_mday))
return 60 * (60 * (24 * days_since_1970 + t.tm_hour) + t.tm_min) + t.tm_sec
}
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