Adjust Date/Time

Adjust Date/Time

Is there a way to make the widget or player act as though it is a different date and/or time than it actually is? For example, if I'm setting up something to happen on a specific date/time, is there a way to make the player act as though it was that day/time to see if what I've set up works? Or, as another example, to see how it will pull/display calendar info  (ICS) for a future date?