For those people with other religious beliefs that don't acknowledge Jesus as their Messiah, what date is it for them? I know there are other calendars but everyone must still conform to the Business or "Christian" calendar. Today's date and time are based off of the Birth of Christ. Example: You can't mail a payment in for a bill and state, its not late, based off of my calendar.
and http://webexhibits.org/calendars/year-history.html#SECTION00380000000000000000 Only the year is based on the birth of Jesus, there rest is an assortment of Gods and numbers. Current accepted terminology is BCE (Before Current Era) and CE (Current) replacing B.C. & A.D.