- To find your next KDay, enter your birth date, leave the number of days blank and Click Calculate KDay
- To find when you will be a specific number of days old, enter your birthday and the number of days and click Calculate KDay.
- To find the number of days between your birthday and a specific date, enter the two dates and click Calculate Number of Days.
- To find a birthday that corresponds to a particular KDay, enter the KDay date and the number of days and click Calculate Birthday
Invalid dates, such as November 31, 1944, will be converted into some valid date, such as December 1, 1944.