Enter your date of birth to see exactly how many days remain until your next birthday. The calculator also shows your upcoming birthday date and your current age. All calculations run locally in your browser.
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The calculator uses JavaScript's built-in Date object to find the difference between your date of birth and today. It counts complete years first, then remaining months, then remaining days, correctly handling leap years and months of different lengths. Total days are calculated from the raw millisecond difference between the two dates.
All calculations are pure JavaScript running in your browser tab. Your date of birth is not sent to our servers, stored, or logged at any point.
To work out days between any two dates, use the date calculator. For converting between Unix timestamps and human dates, try Unix timestamp. To convert times across zones, see the timezone converter.