Legally I was married Dec 18!?

So today we were finally able to go to the Cainta, Municipal Hall to pick up our marriage certificate. It didn't take long, when we got back to the car to look it over we discovered it said our date of marriage was December 18th, 2009 instead of December 19th, 2009! We went back to the building to find out why it had the incorrect date. Turns out because December 19th was a Saturday it is not considered a working day. So they take it back to the last working day, which would be Friday December 18th. Needless to say I'm a little upset about this. So even though technially we were married on Saturday, December 19th, 2009 at the mayors office. In the eyes of the law, legally we were married December 18th, 2009. It's like they erased my wedding day. I don't know why they just didn't marry us on that Friday instead. Why do a wedding on a Saturday when it can't be filed as a legal date?! So now when we celebrate our anniversary every year on December 19th, legally that is not the day we were married. When I fill out any legal paperwork in the future, it will have to have the December 18th date. All I can say is blah.....