Mine is fine.
Try shutting your phone off and turning it back on. (Press and hold the power button for 2 seconds, then release and select the "Turn phone off" option from the top of the list. Once off, press and hold the power button again for 2 seconds to start it up again.)
If that doesn't work, go into Settings -> Date & Time and make sure "Automatic" is checked. If it is and you still have the wrong time, uncheck it and set it manually.