Package interval
Shorthands to create interval:
interval.Months(months int) *interval.Interval
interval.Years(years int) *interval.Interval
interval.Seconds(seconds int) *interval.Interval
interval.Minutes(minutes int) *interval.Interval
interval.Hours(hours int) *interval.Interval
interval.Days(days int) *interval.Interval
interval.Weeks(weeks int) *interval.Interval
Geenral usage:
month := interval.Months(1)
interval.Add(time.Now(), month) // Will correctly add 1 month (beware that months can not be represented as seconds as they are of variadic length)
seconds := interval.Seconds(86400)
interval.Add(time.Now(), seconds)
// Absolutely the same:
day := interval.Days(1)
interval.Add(time.Now(), day)
Package periodic
periodic.Periodic simply represents periodic event (when it starts, when it ends and how often does it occur).
Geenral usage:
start := time.Parse("2 Jan 2006", "1 Jan 2000")
end := time.Parse("2 Jan 2006", "15 Jan 2000")
fortnightly := periodic.Fortnightly(start, end) // fortnightly means once in 2 weeks ("bi-weekly").
fortnightly.Matches(time.Parse("2 Jan 2006", "8 Jan 2000"))
fortnightly.Matches(time.Parse("2 Jan 2006", "15 Jan 2000"))
fortnightly.Matches(time.Parse("2 Jan 2006", "22 Jan 2000")) // false -> overdue!
You can omit periodic end date denoting that periodic event occurs indefinitely. This is done by specifying "zero" date as seconds param:
start := time.Parse("2 Jan 2006", "1 Jan 2000")
fortnightly := periodic.Fortnightly(start, time.Time{}) // runs indefinitely
fortnightly.Matches(time.Parse("2 Jan 2006", "22 Jan 2000")) // true