Timezone database changes

I had a thought a week ago.  If we update the time zone database for
future dates, and you have a future date/time stored, doesn't the time
change when the time zone database changes.

For example if I schedule an appointment in New Zealand for 10:00a and
we change the time zone database so that date is now daylight savings,
doesn't the time change to display as 9 or 11am?  That seems pretty bad.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://postgres.enterprisedb.com
 + If your life is a hard drive, Christ can be your backup. +