Date and time calculators
Quick, private tools for ordinary calendar and time questions. Choose the calculation you need; everything runs in your browser.
Date spans
Count calendar days, weeks, or working days between dates.
- Days Between DatesCount calendar days between two dates with a clear inclusion choice.
- Weeks Between DatesCount the weeks and days between two calendar dates.
- Business Days Between DatesCount weekdays, with an optional observed US federal-holiday policy.
- Age CalculatorFind age in years, months, and days between a birth date and an as-of date.
- Week NumberSee the ISO week number and ISO week-year of any date.
- Weekends CounterCount how many weekend days fall between two calendar dates.
Dates and deadlines
Find a future or past date, weekday, or business-day deadline.
- Date CalculatorAdd or subtract calendar days, weeks, months, or years.
- Days From TodayFind the date that is N days, weeks, months, or years from today.
- Business Days From TodayFind the date that is N business days from today.
- Day of the Week CalculatorSee what day of the week a date was or will be.
- Add or Subtract Business DaysMove a date forward or backward by a number of business days.
- Days UntilCount the whole calendar days from today to a chosen date.
- Leap Year CheckerCheck whether a year is a leap year on the Gregorian calendar.
- Next WeekdayFind the date of the next or previous occurrence of a chosen weekday.
Times and work
Measure elapsed time, worked time, and decimal hours.
- Hours Between TimesFind an elapsed duration between two 24-hour times.
- Minutes Between TimesFind the elapsed minutes between two 24-hour times.
- Work Hours CalculatorCalculate worked hours between two times with an unpaid break.
- Decimal Hours CalculatorConvert hours and minutes to decimal hours, or decimal hours back to HH:MM.
- Time Zone ConverterConvert a time between named time zones, resolving daylight-saving changes honestly.
- Add or Subtract TimeShift a time of day by an amount of hours and minutes.
- Date & Time DurationMeasure the span between two full dates and times, in days, hours, and minutes.
- Time Unit ConverterConvert between hours, minutes, seconds, days and weeks.
A quiet place for ordinary calculations
These tools are built for a quick answer without an account, a spreadsheet, or a feature you did not ask for. They use ordinary calendar dates and 24-hour times.