Schedule Time Zone

[dougp]

When saving a schedule today I got a warning message I have never seen:

Update schedule

If you click OK, the time zone for this schedule will change to your time zone. To close the schedule without changing it, click Cancel.

I don't see anywhere to set the time zone for a schedule.
Is this message because I just changed from Daylight time (PDT) to Standard time (PST)?
Does this warning really mean nothing?