Navigator 2.0, Internet Explorer 3.0
The millisecond representation of the specified Date object date. That is, this method returns the number of milliseconds between midnight (GMT) on 1/1/1970 and the date and time specified by date.
getTime() converts a date and time to a single integer. This is useful when you want to compare two Date objects or to determine the time elapsed between two dates.
Date.parse() and Date.UTC() allow you to convert a date and time specification to millisecond representation without going through the overhead of first creating a Date object.