JavaScript 1.0; JScript 1.0; ECMAScript v1
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.