For Android 2.1 and upper
239 votesBrenton commented
I think there are Android resource benefits to come from this:
Let's say I know I'm at work between 0900 and 1700 and I don't want setting profiles to perform any event based monitoring (ie, cell location)
IF Time = 0900-1700 - THEN 'de-activate' 'rule x'
Lets say 'rule x' is the only rule configured - a cell-location based event rule.
By implicitly de-activating it between those hours, Setting Profiles should not need to poll for *network location* and keep the phone awake (wakelock). It only needs to keep track of time. Therefore, battery is saved.