If your experience is like the others before you , you'll have unexplained date shift. This doesn't have anything to do with the X-files movie. As near as I can tell, we are given an initial date after configuration, the fingers and eyes crossed date (mo/yr.). After that you receive a day date range based on production scheduling. This one will slip and slide until you reach the crossroads and you actually pass the initial date. Its not over yet, the date will eventually establish itself four days in the past. For all intents and purposes, that may be the procuction date for your baby (happy birthday!).
If you are OCD, there are many posts that can take you deeper into the chaos.
Cheers,
26.2