Counting Days - Available for free on Google Play

This app will help you keep track of the number of days since or until various events that you give it. For instance, it will tell you the number of days until New Year's Eve, or since last New Year's Eve. It can tell you the number of days until your birthday or the birthday of a loved one. It can also be used as a sort of sobriety clock, to keep track of the number of days since your last cigarette, or the last time you had a drink.

Get it for free on Google Play here:

https://play.google.com/store/apps/details?id=ericsweeten.com.countingdays