Returns the hours value in a Date object using Universal Coordinated Time (UTC).
The required dateObj reference is a Date object.
To get the number of hours elapsed since midnight using local time, use the getHours method.
The getUTCHours method returns an integer between 0 and 23 indicating the number of hours since midnight. A zero occurs in two situations: the time is before 1:00:00 A.M., or a time was not stored in the Date object when the object was created. The only way to determine which situation you have is to also check the minutes and seconds for zero values. If they are all zeroes, it is nearly certain that the time was not stored in the Date object.
The following example illustrates the use of the getUTCHours method.