32 lines
1.1 KiB
V
32 lines
1.1 KiB
V
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module time
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// days_from_civil - return the number of days since the
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// Unix epoch 1970-01-01. A detailed description of the algorithm here
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// is in: http://howardhinnant.github.io/date_algorithms.html
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// Note that it will return negative values for days before 1970-01-01.
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pub fn days_from_civil(oy int, m int, d int) int {
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y := if m <= 2 { oy - 1 } else { oy }
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era := y / 400
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yoe := y - era * 400 // [0, 399]
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doy := (153 * (m + (if m > 2 { -3 } else { 9 })) + 2) / 5 + d - 1 // [0, 365]
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doe := yoe * 365 + yoe / 4 - yoe / 100 + doy // [0, 146096]
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return era * 146097 + doe - 719468
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}
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// portable_timegm does the same as C._mkgmtime, but unlike it,
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// can work with dates before the Unix epoch of 1970-01-01 .
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pub fn portable_timegm(t &C.tm) i64 {
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mut year := t.tm_year + 1900
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mut month := t.tm_mon // 0-11
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if month > 11 {
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year += month / 12
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month %= 12
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} else if month < 0 {
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years_diff := (11 - month) / 12
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year -= years_diff
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month += 12 * years_diff
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}
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days_since_1970 := i64(days_from_civil(year, month + 1, t.tm_mday))
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return 60 * (60 * (24 * days_since_1970 + t.tm_hour) + t.tm_min) + t.tm_sec
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}
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