A Date object contains a number representing a particular instant in time to within a millisecond. If the value of an argument is greater than its range or is a negative number, other stored values are modified accordingly. For example, if you specify 150 seconds, JScript redefines that number as two minutes and 30 seconds.
If the number is NaN, the object does not represent a specific instant of time. If you pass no parameters to the Date object, it is initialized to the current time (UTC). A value must be given to the object before you can use it.
The range of dates that can be represented in a Date object is approximately 285,616 years on either side of January 1, 1970.
The Date object has two static methods that are called without creating a Date object. They are parse and UTC.