Manipulacion de fechas

getTime (Date.getTime method)
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.

Availability: ActionScript 1.0; Flash Player 5

Returns
Number - An integer.

Example
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());