BlackForestBytes
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goext
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v0.0.268 added WeekStart() and WeekEnd()
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This commit is contained in:
Mike Schwörer 2023-09-21 16:29:23 +02:00
parent 5f5f0e44f0
commit c08a739158
Signed by: Mikescher
GPG Key ID: D3C7172E0A70F8CF
3 changed files with 55 additions and 2 deletions
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4
goextVersion.go
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@ -1,5 +1,5 @@
package goext
const GoextVersion = "0.0.267"
const GoextVersion = "0.0.268"
const GoextVersionTimestamp = "2023-09-21T14:15:02+0200"
const GoextVersionTimestamp = "2023-09-21T16:29:23+0200"

28
timeext/calendarweek.go Normal file
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@ -0,0 +1,28 @@
package timeext
import "time"
func WeekStart(year, week int) time.Time {
// https://stackoverflow.com/a/52303730/1761622
// Start from the middle of the year:
t := time.Date(year, 7, 1, 0, 0, 0, 0, time.UTC)
// Roll back to Monday:
if wd := t.Weekday(); wd == time.Sunday {
t = t.AddDate(0, 0, -6)
} else {
t = t.AddDate(0, 0, -int(wd)+1)
}
// Difference in weeks:
_, w := t.ISOWeek()
t = t.AddDate(0, 0, (week-w)*7)
return t
}
func WeekEnd(year, week int) time.Time {
return WeekStart(year, week).AddDate(0, 0, 7).Add(time.Duration(-1))
}

25
timeext/calendarweek_test.go Normal file
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@ -0,0 +1,25 @@
package timeext
import (
"gogs.mikescher.com/BlackForestBytes/goext/tst"
"testing"
"time"
)
func TestWeekStart(t *testing.T) {
tst.AssertEqual(t, WeekStart(2018, 1).Format(time.RFC3339Nano), "2018-01-01T00:00:00Z")
tst.AssertEqual(t, WeekStart(2018, 2).Format(time.RFC3339Nano), "2018-01-08T00:00:00Z")
tst.AssertEqual(t, WeekStart(2019, 1).Format(time.RFC3339Nano), "2018-12-31T00:00:00Z")
tst.AssertEqual(t, WeekStart(2019, 2).Format(time.RFC3339Nano), "2019-01-07T00:00:00Z")
}
func TestWeekEnd(t *testing.T) {
tst.AssertEqual(t, WeekEnd(2018, 1).Format(time.RFC3339Nano), "2018-01-07T23:59:59.999999999Z")
tst.AssertEqual(t, WeekEnd(2018, 2).Format(time.RFC3339Nano), "2018-01-14T23:59:59.999999999Z")
tst.AssertEqual(t, WeekEnd(2019, 1).Format(time.RFC3339Nano), "2019-01-06T23:59:59.999999999Z")
tst.AssertEqual(t, WeekEnd(2019, 2).Format(time.RFC3339Nano), "2019-01-13T23:59:59.999999999Z")
}