Date & time
calculators

Ages, differences, durations, workdays, and time-zone conversions.

10 tools. Calculations run locally and every page explains its method.

  1. Date & timeAge CalculatorCalculate exact age in years, months, and days on a chosen date.
  2. Date & timeDate CalculatorFind a calendar date a specified number of days, weeks, months, or years away.
  3. Date & timeDate Difference CalculatorMeasure elapsed calendar and total time between two dates.
  4. Date & timeDate Add / Subtract CalculatorAdd or subtract a precise mix of years, months, weeks, and days from a date.
  5. Date & timeAge Difference CalculatorCompare two birth dates and calculate the exact age gap.
  6. Date & timeTime CalculatorAdd or subtract clock times and durations across midnight.
  7. Date & timeTime Duration CalculatorCalculate elapsed hours and minutes between two clock times.
  8. Date & timeCountdown CalculatorShow the live time remaining until a chosen local date and time.
  9. Date & timeWorking & Business Days CalculatorCount weekdays between dates with configurable weekends and manually entered holidays.
  10. Date & timeTime Zone ConverterConvert a date and time between browser-supported IANA time zones without a network request.