fmt.Println(umt.UnixMilli())
	t := time.UnixMilli(umt.UnixMilli()).UTC()
	fmt.Println(t)

	// Output:
	// 1257894000000
	// 2009-11-10 23:00:00 +0000 UTC
}

func ExampleTime_Unix() {
	// 1 billion seconds of Unix, three ways.
	fmt.Println(time.Unix(1e9, 0).UTC())     // 1e9 seconds
	fmt.Println(time.Unix(0, 1e18).UTC())    // 1e18 nanoseconds