server and local time difference

[Affy]

i've been trying to make my own plugboard but i've encountered a problem.

$date = date("Y-m-d h:i a", $timestamp);

to manage the click count i use $timestamp to make a unique id for each link. and the only way to convert $timestamp to Y-m-d h:i a format is to use the viarable $date. but the problem is there is a +13 hours difference between my time and the servers time.

any ideas how make the $date +13 hours ahead?
btw, my $timestamp format is something like 1133044456. not so sure what's it called.

[laserlight]

Add 136060=46800 seconds to the timestamp.

Conversely, a strtotime("+13 hours") could give you the timestamp you want.