>>What would happen if you set up a scheduled task for 02:30 on the
day that we return to standard time since there would theoretically be
two 02:30's for that morning? Would it run twice?

There is a simple way to make sure an application is run at least one and only 
one time:

Say you have it schedule at 2:30. Schedule it once every hour from 2:30 to 3:31
At begining of the app:
1. check if this app was already run for today's date, if yes, abort.
2. store somewhere today's date and proceed.

Normally, id there is no 2:00-3:00 hour, the application should be scheduled at 
3:30
In other cases, there will be one or two extra tasks scheduled, but they will 
abort (gracefuly)

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