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Date Difference Calculator
Find out how much time separates two dates.
Open ToolUtilities
Age Calculator
Calculate age and next birthday from a birth date.
Age result
- Years, months, days
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- Total months
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- Total weeks
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- Total days
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- Approximate total hours
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- Next birthday
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- Days until next birthday
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Feb. 29 birthdays are observed on March 1 in non-leap years.
How to use
Enter a date of birth and choose the date to calculate age on. The age-on date defaults to today. Select Calculate, Reset, or Copy Results when you need the result elsewhere.
What this tool does
Calculates complete years, months, and days using real calendar dates, then shows total months, weeks, days, approximate hours, and the next birthday.
Impossible dates are rejected by the date fields and by the calculator. Feb. 29 birthdays use March 1 as the non-leap-year birthday convention.