Check if date is first of quarter or semester

main.go

func IsFirstOfQuarter(t time.Time) bool {
	dateString := t.Format("01-02")
	if dateString == "01-01" ||
		dateString == "04-01" ||
		dateString == "07-01" ||
		dateString == "10-01" {
		return true
	}
	return false
}

func IsFirstOfSemester(t time.Time) bool {
	dateString := t.Format("01-02")
	if dateString == "01-01" ||
		dateString == "06-01" {
		return true
	}
	return false
}