Mike Schwörer
3a17edfaf0
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45 lines
1.4 KiB
Go
45 lines
1.4 KiB
Go
package timeext
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import "time"
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// YearDifference calculates the difference between two timestamps in years.
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// = t1 - t2
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// returns a float value
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func YearDifference(t1 time.Time, t2 time.Time, tz *time.Location) float64 {
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yDelta := float64(t1.Year() - t2.Year())
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processT1 := float64(t1.Sub(TimeToYearStart(t1, tz))) / float64(TimeToYearEnd(t1, tz).Sub(TimeToYearStart(t1, tz)))
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processT2 := float64(t2.Sub(TimeToYearStart(t2, tz))) / float64(TimeToYearEnd(t2, tz).Sub(TimeToYearStart(t2, tz)))
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return yDelta + (processT1 - processT2)
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}
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// MonthDifference calculates the difference between two timestamps in months.
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// = t1 - t2
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// returns a float value
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func MonthDifference(t1 time.Time, t2 time.Time) float64 {
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yDelta := float64(t1.Year() - t2.Year())
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mDelta := float64(t1.Month() - t2.Month())
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dDelta := float64(0)
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t1MonthDays := DaysInMonth(t1)
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t2MonthDays := DaysInMonth(t2)
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if t2.Year() > t1.Year() || (t2.Year() == t1.Year() && t2.Month() > t1.Month()) {
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dDelta -= 1
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dDelta += float64(t1MonthDays-t1.Day()) / float64(t1MonthDays)
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dDelta += float64(t2.Day()) / float64(t2MonthDays)
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} else if t2.Year() < t1.Year() || (t2.Year() == t1.Year() && t2.Month() < t1.Month()) {
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dDelta -= 1
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dDelta += float64(t1.Day()) / float64(t1MonthDays)
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dDelta += float64(t2MonthDays-t2.Day()) / float64(t2MonthDays)
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} else {
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dDelta += float64(t1.Day()-t2.Day()) / float64(t1MonthDays)
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}
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return yDelta*12 + mDelta + dDelta
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}
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