Every date tells a story.
Find a calendar age today or on another date, down to the remaining months and days.
Birth date excluded; calculation date included
Each week contains exactly seven days
2027-01-01 · year-month-day
Calendar dates, not exact birth times. February 29 anniversaries use February 28 in non-leap years. Month-end anniversaries clamp to the last day of the month. Legal age conventions can differ.
Calendar age is more
than days divided by 365.
Months have different lengths and leap years add a day. We count completed calendar years first, then completed months, then the remaining days. Total days are also shown separately, so the two results answer different questions.
Try a familiar example
From 15 June 2000 to 20 August 2026, the result is 26 years, 2 months and 5 days. The years end on 15 June 2026, the two months end on 15 August, and five days remain.
You can set the second date to a past event or future milestone. “Use today” selects your device’s local calendar date. The tool does not ask for or use your time of birth.
Dates and edge cases
We compare calendar dates using UTC day arithmetic, so daylight-saving clock changes do not turn a day into 23 or 25 hours. The date of birth is excluded from elapsed-day totals; identical dates produce zero days.
For a February 29 birthday, this tool uses February 28 as the anniversary in a non-leap year. For an anniversary that would fall beyond the end of a month, it uses that month’s last day.
For example, 31 January to 28 February in a non-leap year is one calendar month under this convention. Other systems may represent that interval differently.
Use the right convention
Legal, school and administrative age rules can differ, especially for leap-day births. This calculator reports its stated calendar convention and does not determine eligibility.
A few date questions
Does the next birthday include today?
Yes. If the calculation date is the birthday anniversary, the countdown is zero and the birthday shown is that date.
Will a shared summary expose my date of birth?
Inputs are excluded by default. The summary still contains age and next birthday, so review it before sharing. You can download it for your own use without sending anything.