Derwin0 - that shouldn't be necessary since any pre-existing (and pre-firing) timer will be fine. The only problem is with a timer you create now (before the time change) that is not supposed to fire until after the time change. This includes one-time and recurring timers. This is because as of now (before the time change), your guide data is an hour off. Once the time change rolls around, the guide data will be correct. If you must create a new timer before the time change that is not supposed to fire until after the time change, just set its times manually to the correct real times.