With Apple's new command line tool xcrun simctl status_bar you can now set up the status bar in the simulator as you like without any need for 3rd party programs, however, I can't get it to change the date for bigger devices like the iPad Pro (12.9-inch).
In the help menu it states that if you enter a valid ISO date then it adapts that on devices where this is relevant: xcrun simctl status_bar --help
So I enter a valid ISO date 2016-09-18T17:34:02.666Z, but the status bar will afterwards look like this:
date not correctly changed