73 lines
1.1 KiB
Go
73 lines
1.1 KiB
Go
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package timeext
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import (
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"time"
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)
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var isoWeekCountAggregate map[int]int
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func init() {
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isoWeekCountAggregate = make(map[int]int)
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for y := 1900; y <= time.Now().Year(); y++ {
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GetAggregateIsoWeekCount(y)
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}
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}
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func GetAggregateIsoWeekCount(year int) int {
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if v, ok := isoWeekCountAggregate[year]; ok {
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return v
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}
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if year == 1900 {
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isoWeekCountAggregate[year] = 0
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return 0
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}
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if year < 1900 {
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s := 0
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for yy := year; yy < 1900; yy++ {
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s += GetIsoWeekCount(yy)
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}
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w := -s
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isoWeekCountAggregate[year] = w
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return w
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}
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w := GetIsoWeekCount(year)
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w += GetAggregateIsoWeekCount(year - 1)
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isoWeekCountAggregate[year] = w
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return w
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}
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func GetIsoWeekCount(year int) int {
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_, w1 := time.Date(year+0, 12, 27, 0, 0, 0, 0, TimezoneBerlin).ISOWeek()
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_, w2 := time.Date(year+0, 12, 31, 0, 0, 0, 0, TimezoneBerlin).ISOWeek()
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_, w3 := time.Date(year+1, 1, 4, 0, 0, 0, 0, TimezoneBerlin).ISOWeek()
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w1 -= 1
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w2 -= 1
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w3 -= 1
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w := w1
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if w2 > w {
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w = w2
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}
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if w3 > w {
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w = w3
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}
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return w
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}
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func GetGlobalWeeknumber(t time.Time) int {
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y, w := t.ISOWeek()
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w -= 1
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if y <= 1900 {
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w -= 1
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}
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return GetAggregateIsoWeekCount(y-1) + w
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}
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