But wait, there's more! If you use the AM/PM clock format there will be two times in the day that add an additional three digits to Pi. At 9:26, both AM and PM, you can tack those three numbers onto the end of the date, and you get: 3.1415926. You could also use seconds, nanoseconds, etc. if you wish, but I am going to limit it to what I already stated for time's sake.
Have a happy Pi day! Oh, and have a celebratory piece of pie if it's convenient for you. ;)