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diff.go
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diff.go
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package timehelper
import (
"time"
)
// diff returns difference (t2 - t1) truncated to whole number of 'durs'.
func diff(t1, t2 time.Time, dur time.Duration) int {
// inspired by https://github.com/ribice/dt/blob/c4e011852071395c6d984ef7b3b579f5951c88de/date.go#L81
deltaUnix := t2.In(time.UTC).Unix() - t1.In(time.UTC).Unix()
return int(deltaUnix / int64(dur/time.Second))
}
// DayDiff returns number of whole days containing in difference (t2 - t1).
// If 't2' is before 't1', the result (if not zero) is negative.
func DayDiff(t1, t2 time.Time) int {
return diff(t1, t2, Day)
}
// WeekDiff returns number of whole weeks containing in difference (t2 - t1).
// If 't2' is before 't1', the result (if not zero) is negative.
func WeekDiff(t1, t2 time.Time) int {
return diff(t1, t2, Week)
}
// MonthDiff returns number of whole months containing in difference (t2 - t1).
// If 't2' is before 't1', the result (if not zero) is negative.
func MonthDiff(t1, t2 time.Time) int {
var after, before time.Time
var negative bool
if t1.After(t2) {
after = t1
before = t2
negative = true
} else {
after = t2
before = t1
negative = false
}
r := 12*(after.Year()-before.Year()) + int(after.Month()) - int(before.Month())
if r == 0 {
return 0
}
if after.Day() < before.Day() {
r--
}
if negative {
return -r
}
return r
}
// YearDiff returns number of whole years containing in difference (t2 - t1).
// If 't2' is before 't1', the result (if not zero) is negative.
func YearDiff(t1, t2 time.Time) int {
var after, before time.Time
var negative bool
if t1.After(t2) {
after = t1
before = t2
negative = true
} else {
after = t2
before = t1
negative = false
}
r := after.Year() - before.Year()
if r == 0 {
return 0
}
if after.YearDay() < before.YearDay() {
r--
}
if negative {
return -r
}
return r
}