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95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
package date
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import (
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"fmt"
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"strings"
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"time"
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)
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type (
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// Interval represents a human-minded diff of two dates which is in
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// no way interchangeable with a time.Duration: The DateInterval
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// takes each date component and subtracts them. This causes the
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// 03/25 to be exactly one month distant from 02/25 even though the
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// distance would be different than with 03/25 and 04/25 which is
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// also exactly one month.
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Interval struct {
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Years int
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Months int
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Days int
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Hours int
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Minutes int
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Seconds int
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}
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)
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// NewInterval creates an Interval from two given dates
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func NewInterval(a, b time.Time) (i Interval) {
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var l, u time.Time
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if a.Before(b) {
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l, u = a.UTC(), b.UTC()
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} else {
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l, u = b.UTC(), a.UTC()
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}
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i.Years = u.Year() - l.Year()
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i.Months = int(u.Month() - l.Month())
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i.Days = u.Day() - l.Day()
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i.Hours = u.Hour() - l.Hour()
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i.Minutes = u.Minute() - l.Minute()
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i.Seconds = u.Second() - l.Second()
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if i.Seconds < 0 {
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i.Minutes, i.Seconds = i.Minutes-1, i.Seconds+60 //nolint:gomnd
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}
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if i.Minutes < 0 {
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i.Hours, i.Minutes = i.Hours-1, i.Minutes+60 //nolint:gomnd
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}
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if i.Hours < 0 {
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i.Days, i.Hours = i.Days-1, i.Hours+24 //nolint:gomnd
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}
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if i.Days < 0 {
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// oh boi.
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i.Months, i.Days = i.Months-1, daysInMonth(u.Year(), int(u.Month())-1)+i.Days
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}
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if i.Months < 0 {
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i.Years, i.Months = i.Years-1, i.Months+12 //nolint:gomnd
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}
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return i
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}
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func daysInMonth(year, month int) int {
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return time.Date(year, time.Month(month+1), 1, 0, 0, 0, 0, time.Local).Add(-time.Second).Day()
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}
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// Format takes a template string analog to a strftime string and formats
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// the Interval accordingly:
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//
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// %Y / %y = Years with / without leading digit to 2 places
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// %M / %m = Months with / without leading digit to 2 places
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// %D / %d = Days with / without leading digit to 2 places
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// %H / %h = Hours with / without leading digit to 2 places
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// %I / %i = Minutes with / without leading digit to 2 places
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// %S / %s = Seconds with / without leading digit to 2 places
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func (i Interval) Format(tplString string) string {
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return strings.NewReplacer(
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"%Y", fmt.Sprintf("%02d", i.Years),
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"%y", fmt.Sprintf("%d", i.Years),
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"%M", fmt.Sprintf("%02d", i.Months),
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"%m", fmt.Sprintf("%d", i.Months),
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"%D", fmt.Sprintf("%02d", i.Days),
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"%d", fmt.Sprintf("%d", i.Days),
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"%H", fmt.Sprintf("%02d", i.Hours),
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"%h", fmt.Sprintf("%d", i.Hours),
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"%I", fmt.Sprintf("%02d", i.Minutes),
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"%i", fmt.Sprintf("%d", i.Minutes),
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"%S", fmt.Sprintf("%02d", i.Seconds),
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"%s", fmt.Sprintf("%d", i.Seconds),
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).Replace(tplString)
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}
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