Curious... That time isn't even Standard Time for America/New_York at the moment. I have PM display times in my local time zone (currently EDT, same as America/New_York at the moment). That tells me that your reply was posted at
2008-09-19 16:10:07 EDT, which would be
15:10:07 EST, yet you show
17:15:48 from
DateTime->now. That's
about an hour off, but it's in the wrong direction.
What does Windows think your time is (and might as well check it's notion of the time zone, too)? I'm stretching here; I don't have a Windows system that I can use to check this.
Update:One other thing that might be worth checking:
my $isdst = ( localtime(time) )[-1];
print "$isdst\n";