How to schedule job to run on every 2nd thursday of month at 10:10 AM

[maddalieswar]

How to schedule job to run on every 2nd thursday of month at 10:10 AM using cron expression or predefined functions.

I tried multiple ways but it did not work.Tried below cron expressions:

1 54 8 1-8 * THU (This approach is to schedule job based on day of month)
1 54 8 * * 4#2

Can someone please help.

[janrnc]

Hello @maddalieswar,

you could start from something like this. I didn't test it in detail, give it a proper review:

type schedule struct{}
func (s *schedule) Next(now time.Time) time.Time {
	dayOfMonth := secondThursday(now.Year(), now.Month())
	result := time.Date(now.Year(), now.Month(), dayOfMonth, 10, 10, 0, 0, now.Location())
	if result.Before(now) {
		nextMonth := result.AddDate(0, 1, 0)
		dayOfMonth = secondThursday(nextMonth.Year(), nextMonth.Month())
		result = time.Date(nextMonth.Year(), nextMonth.Month(), dayOfMonth, 10, 10, 0, 0, now.Location())
	}
	return result
}

func secondThursday(year int, month time.Month) int {
	count := 0
	daysOfMonth := daysIn(month, year)
	for day := 1; day <= daysOfMonth; day++ {
		date := time.Date(year, month, day, 0, 0, 0, 0, time.UTC)
		if date.Weekday() == 4 {
			count += 1
		}
		if count >= 2 {
			return day
		}
	}
	panic("cannot find second thursday of month")
}

func daysIn(month time.Month, year int) int {
	return time.Date(year, month+1, 0, 0, 0, 0, 0, time.UTC).Day()
}