Explain Date() to me...

[Jack_In_The_Box]

Ok, I have this code:

<SCRIPT TYPE="text/javascript">

    LocalTime        = new Date();

    document.cookie  = "time=" + LocalTime;

</SCRIPT>

Now, the part I need explanation is this:

Some machines display the time like this: Sun Jan 15 22:27:40 EST 2005
and others like this: Fri Dec 16 2005 09:16:14 GMT-0800 (GMT-8 Pacific Time (U.S./Canada/Mexico))

Why the difference?, I thought the format was "fixed"