This program tells you how many days it will be until your next birthday. Please enter today's date: What is the month (1-12)? 1 What is the day (1-31)? 1 1/1 is day #1 of 365. Please enter your birthday: What is the month (1-12)? 12 What is the day (1-31)? 31 12/31 is day #365 of 365. Your next birthday is in 364 days. << your birthday fact >>