Daylight savings

Hi all,

I'm wondering if anyone has scripts or knows of any tools which will detect 
the next DST change, and setup a cronjob to be run just before it?

This is so we can have certain types of data which are stored in the database 
as localtime, updated to still be correct during DST and after.

At present I'm considering running a mismash of zdump, perl, psql, etc, and 
I'm kind of hoping there's already something out there.

Regards and best wishes,

Justin Clift