extract time from datetime using javascript

Question

how can i extract time from datetime format.

my datetime format is given below.

var datetime =2000-01-01 01:00:00 UTC;

I only want

Answer 1

var date1 = new Date(1945,10,20, 17,30)
var date2 = new Date(1970,1,8, 12,00)

console.log(date1.getHours() - 8 + (date1.getMinutes()/60))

console.log(date2.getHours() - 8 + (date2.getMinutes()/60))