I'm looking at creating a website that basically saves times and dates
and emails specific people (all taken from a mysql database) when times
have passed. I suppose something like a birthday reminder site, but not
quite.

All I'd like to know is: Is this possible and how much of an
undertaking is it to get the emails out at specific times, instead of
run as a batch at fixed times from a linux cron script.

Cheers
J