Date.now()	→
Date.parse("2019/5/1")	→
Date.parse("2019/5/1 12:00:00 GMT+900")	→
Date.parse("2019/5/1 12:00:00 GMT")	→
Date.UTC(2019, 4, 1)	→
Date.UTC(2019, 4, 1, 12)	→
Date.UTC(2019, 4, 1, 12, 5)	→
Date.UTC(2019, 4, 1, 12, 5, 30)	→
Date.UTC(2019, 4, 1, 12, 5, 30, 500)	→