goext/timeext/diff.go
Mike Schwörer 3a17edfaf0
All checks were successful
Build Docker and Deploy / Run goext test-suite (push) Successful in 6m2s
v0.0.509
2024-08-26 14:35:49 +02:00

45 lines
1.4 KiB
Go

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