set a Date in milliseconds
milliseconds The number of milliseconds between the desired date and time and midnight GMT on January 1, 1970. A millisecond value of this type may also be passed to the Date() constructor and may be obtained by calling the Date.UTC()and Date.parse()methods. Representing a date in this millisecond format makes it independent of time zone.
The milliseconds argument. Prior to ECMAScript standardization, this method returns nothing.