Returns the day of the week value in a Date object using local time.
The required dateObj reference is a Date object.
To get the day using Universal Coordinated Time (UTC), use the getUTCDay method.
The value returned from the getDay method is an integer between 0 and 6 representing the day of the week and corresponds to a day of the week as follows:
Day of the Week
The following example illustrates the use of the getDay method.