Anniversary & Birthday Countdown Calculator
Find the days remaining until your next birthday or anniversary.
Assumptions used in this calculation
- Leap day birthdays: A 29 February original date is treated as 28 February in non-leap years when finding the next occurrence.
- Today's date: Uses the current date in your device's local timezone as the reference point.
About this calculator
The anniversary and birthday countdown calculator finds how many days remain until the next occurrence of a recurring annual date, and which milestone number (age or anniversary year) it will be.
Worked example
Birthday on 20 July
Result: Days until next birthday
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