public getTime() : Number
Returns the number of milliseconds since midnight January 1, 1970, universal time, for the specified Date object. Use this method to represent a specific instant in time when comparing two or more Date objects.
Number - An integer.
The following example uses the constructor to create a Date object based on the current time, and uses the getTime() method to return the number of milliseconds since midnight January 1, 1970:
var my_date:Date = new Date(); trace(my_date.getTime());