Time & Date Calculators

Age, duration, and hours/pay math - all working in base-60 (minutes, seconds) or calendar arithmetic rather than the decimal math the rest of the site uses.

Time arithmetic breaks the usual decimal-carry rules: 75 minutes is not "75" of anything decimal, it is 1 hour 15 minutes, because the unit rolls over at 60, not 10. Age calculations add a second wrinkle - calendar dates, not just durations - since a birth year subtracted from the current year is only correct after that year's birthday has occurred; see the age calculator for the fix.

• AgeCalculate your exact age in years, months, and days from your date of birth.
• TimeAdd, subtract, and convert between hours, minutes, and seconds.
• HoursCalculate total hours and pay from hourly rate and hours worked.