Age & DatesDATE & AGE TOOL
Birthday Countdown
Count the days until your next birthday and see the age you will turn.
How this calculator works
This tool uses calendar dates directly. Date differences are calculated from UTC-normalized calendar dates to avoid daylight-saving-time changes affecting the result. Calendar age counts complete months from the starting date, then remaining days. When a month is shorter, the date is clamped to its last day. For this tool, a 29 February birthday is observed on 28 February in a non-leap year. These are calculation conventions, not legal eligibility rules.
Why use this tool?
It is designed for quick, transparent calculations without requiring an account. Your date inputs are processed in your browser by the current version of the site.
Frequently asked questions
Does this calculator account for leap years?
Yes. Calendar calculations use the actual dates in the Gregorian calendar, including leap years.
Do you store my date of birth?
The calculator processes dates locally in your browser. We do not send the entered dates as analytics events. See our privacy information for site analytics details.
Keep exploring
How many days until my next birthday?
Enter your birth date and a calculation date. The tool finds the first birthday on or after that date and counts the calendar days until it. On your birthday the answer is zero; this is a day counter, not a live seconds countdown.
Worked example
For a 18 May birthday, calculating as of 1 May 2026 gives 17 days remaining.