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wakapi/utils/date.go

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package utils
import (
"fmt"
"time"
)
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func StartOfDay(date time.Time) time.Time {
return FloorDate(date)
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}
func StartOfToday(tz *time.Location) time.Time {
return StartOfDay(FloorDate(time.Now().In(tz)))
}
func EndOfDay(date time.Time) time.Time {
floored := FloorDate(date)
if floored == date {
date = date.Add(1 * time.Second)
}
return CeilDate(date)
}
func EndOfToday(tz *time.Location) time.Time {
return EndOfDay(time.Now().In(tz))
}
func StartOfThisWeek(tz *time.Location) time.Time {
return StartOfWeek(time.Now().In(tz))
}
func StartOfWeek(date time.Time) time.Time {
year, week := date.ISOWeek()
return firstDayOfISOWeek(year, week, date.Location())
}
func StartOfThisMonth(tz *time.Location) time.Time {
return StartOfMonth(time.Now().In(tz))
}
func StartOfMonth(date time.Time) time.Time {
return time.Date(date.Year(), date.Month(), 1, 0, 0, 0, 0, date.Location())
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}
func StartOfThisYear(tz *time.Location) time.Time {
return StartOfYear(time.Now().In(tz))
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}
func StartOfYear(date time.Time) time.Time {
return time.Date(date.Year(), time.January, 1, 0, 0, 0, 0, date.Location())
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}
// FloorDate rounds date down to the start of the day and keeps the time zone
func FloorDate(date time.Time) time.Time {
return time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, date.Location())
}
// FloorDateHour rounds date down to the start of the current hour and keeps the time zone
func FloorDateHour(date time.Time) time.Time {
return time.Date(date.Year(), date.Month(), date.Day(), date.Hour(), 0, 0, 0, date.Location())
}
// CeilDate rounds date up to the start of next day if date is not already a start (00:00:00)
func CeilDate(date time.Time) time.Time {
floored := FloorDate(date)
if floored == date {
return floored
}
return floored.AddDate(0, 0, 1)
}
// SetLocation resets the time zone information of a date without converting it, i.e. 19:00 UTC will result in 19:00 CET, for instance
func SetLocation(date time.Time, tz *time.Location) time.Time {
return time.Date(date.Year(), date.Month(), date.Day(), 0, 0, 0, 0, tz)
}
// WithOffset adds the time zone difference between Local and tz to a date, i.e. 19:00 UTC will result in 21:00 CET (or 22:00 CEST), for instance
func WithOffset(date time.Time, tz *time.Location) time.Time {
now := time.Now()
_, localOffset := now.Zone()
_, targetOffset := now.In(tz).Zone()
dateTz := date.Add(time.Duration((targetOffset - localOffset) * int(time.Second)))
return time.Date(dateTz.Year(), dateTz.Month(), dateTz.Day(), dateTz.Hour(), dateTz.Minute(), dateTz.Second(), dateTz.Nanosecond(), dateTz.Location()).In(tz)
}
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// SplitRangeByDays creates a slice of intervals between from and to, each of which is at max of 24 hours length and has its split at midnight
func SplitRangeByDays(from time.Time, to time.Time) [][]time.Time {
intervals := make([][]time.Time, 0)
for t1 := from; t1.Before(to); {
t2 := StartOfDay(t1).AddDate(0, 0, 1)
if t2.After(to) {
t2 = to
}
intervals = append(intervals, []time.Time{t1, t2})
t1 = t2
}
return intervals
}
func FmtWakatimeDuration(d time.Duration) string {
d = d.Round(time.Minute)
h := d / time.Hour
d -= h * time.Hour
m := d / time.Minute
return fmt.Sprintf("%d hrs %d mins", h, m)
}
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// LocalTZOffset returns the time difference between server local time and UTC
func LocalTZOffset() time.Duration {
_, offset := time.Now().Zone()
return time.Duration(offset * int(time.Second))
}
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// https://stackoverflow.com/a/18632496
func firstDayOfISOWeek(year int, week int, timezone *time.Location) time.Time {
date := time.Date(year, 0, 0, 0, 0, 0, 0, timezone)
isoYear, isoWeek := date.ISOWeek()
for date.Weekday() != time.Monday { // iterate back to Monday
date = date.AddDate(0, 0, -1)
isoYear, isoWeek = date.ISOWeek()
}
for isoYear < year { // iterate forward to the first day of the first week
date = date.AddDate(0, 0, 1)
isoYear, isoWeek = date.ISOWeek()
}
for isoWeek < week { // iterate forward to the first day of the given week
date = date.AddDate(0, 0, 1)
isoYear, isoWeek = date.ISOWeek()
}
return date
}