Can i write a time-trigger?

[Shruthi A <shruthi.iisc@xxxxxxxxx>]

Hello,

Is it possible in postgres to write a trigger that is fired at a certain pre-defined time?   ie I want to write a trigger that checks if the current time is one of a certain list of dates, and if yes, it should be executed.  (I want it to execute only once on a matching date.)

I'm using EnterpriseDB Postgres Plus 8.3

Please help!
Thanks,
Shruthi