Go: Days between two dates

func main() {
        // The leap year 2000 had 366 days.
        t1 := Date(2000, 1, 1)
        t2 := Date(2001, 1, 1)
        days := t2.Sub(t1).Hours() / 24
        fmt.Println(days) // 366
}

func Date(year, month, day int) time.Time {
        return time.Date(year, time.Month(month), day, 0, 0, 0, 0, time.UTC)
}