11 free calculators — Ages, date differences, business days, durations and countdowns — precise to the day.
Calculate exact age in years, months and days from any date of birth.
Use calculatorMeasure the time between two dates in years, months, days and totals.
Use calculatorCount the days from one date to another, exclusive or inclusive.
Use calculatorAdd or subtract any number of days from today — or from a chosen date.
Use calculatorCount working days (Mon–Fri) between two dates, excluding weekends.
Use calculatorCompute the duration between two times of day, even across midnight.
Use calculatorConvert a span into whole weeks and days, or count weeks between dates.
Use calculatorFind what weekday you were born and when the next birthday falls.
Use calculatorCheck whether any year is a leap year and see nearby leap years.
Use calculatorCalculate work days between dates: count weekdays Mon-Fri, exclude holidays, see total days and weekends.
Use calculatorCalculate age difference between two people or dates — see years, months, days and who is older.
Use calculatorDate & Time calculators: Ages, date differences, business days, durations and countdowns — precise to the day. Browse 11 free tools for date & time tasks. Enter values for instant results with formulas shown. No signup needed.
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| Calculator | What It Does | Formula |
|---|---|---|
| Age Calculator | Calculate exact age in years, months and days from any date of birth. | years/months/days = calendar difference between birth date and reference date |
| Date Difference Calculator | Measure the time between two dates in years, months, days and totals. | calendar difference between two dates; total days = end − start in 24-hour units |
| Days Between Dates Calculator | Count the days from one date to another, exclusive or inclusive. | elapsed days = (end − start) ÷ 86,400,000 ms; inclusive adds 1 |
| Days From Today Calculator | Add or subtract any number of days from today — or from a chosen date. | result = start ± N days (calendar arithmetic) |
| Business Days Calculator | Count working days (Mon–Fri) between two dates, excluding weekends. | count of Mon–Fri dates within the selected range |
| Time Duration Calculator | Compute the duration between two times of day, even across midnight. | minutes = (end − start); wrap through midnight if negative |
| Weeks Calculator | Convert a span into whole weeks and days, or count weeks between dates. | weeks = days ÷ 7; average month ≈ 4.345 weeks |
| Birthday Calculator | Find what weekday you were born and when the next birthday falls. | weekday from date; next occurrence of birth month/day after today |
| Leap Year Checker | Check whether any year is a leap year and see nearby leap years. | leap if divisible by 4 AND (not by 100 OR by 400) |
| Work Days Calculator | Calculate work days between dates: count weekdays Mon-Fri, exclude holidays, see total days and weekends. | Work days = total days - weekends - holidays (Mon-Fri count via businessDays) |
| Age Difference Calculator | Calculate age difference between two people or dates — see years, months, days and who is older. | Difference = absolute days between dates; Convert to years/months via dateDiff |
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