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11 tools — 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 calculatorAges, date differences, business days, durations and countdowns — precise to the day.
Use these date & time calculators to compare scenarios with the formula visible on every tool. Each calculator includes a worked example so you can verify the inputs and understand what changes the result.
Results are planning estimates from standard formulas. For medical, financial, legal or structural decisions, use the calculator as a starting point and confirm important decisions with a qualified professional.
| Calculator | What It Does |
|---|---|
| Age Calculator | Calculate exact age in years, months and days from any date of birth. |
| Date Difference Calculator | Measure the time between two dates in years, months, days and totals. |
| Days Between Dates Calculator | Count the days from one date to another, exclusive or inclusive. |
| Days From Today Calculator | Add or subtract any number of days from today — or from a chosen date. |
| Business Days Calculator | Count working days (Mon–Fri) between two dates, excluding weekends. |
| Time Duration Calculator | Compute the duration between two times of day, even across midnight. |
| Weeks Calculator | Convert a span into whole weeks and days, or count weeks between dates. |
| Birthday Calculator | Find what weekday you were born and when the next birthday falls. |
| Leap Year Checker | Check whether any year is a leap year and see nearby leap years. |
| Work Days Calculator | Calculate work days between dates: count weekdays Mon-Fri, exclude holidays, see total days and weekends. |
| Age Difference Calculator | Calculate age difference between two people or dates — see years, months, days and who is older. |