Time & Date Calculators
Count the days between two dates or from today, work out an exact age, add and subtract hours and minutes, and total the hours on a time card — with weekdays, business days and US federal holidays.
33 calculators · A–Z of all calculators
- Age CalculatorExact age in years, months and days, and the countdown to your next birthday.
- Date CalculatorDays and business days between dates, or add and subtract days.
- Business Days CalculatorWorkdays between dates, without federal holidays.
- Days From Today CalculatorThe date 30, 60, 90 or any number of days from today or ago.
- Time CalculatorAdd and subtract hours and minutes, or time on the clock.
- Hours CalculatorHours worked between two times, with breaks and pay.
- Time Card CalculatorWeekly hours from each day's times, overtime over 40 and pay.
- Time to Decimal CalculatorHours and minutes to decimal hours and back.
- Countdown CalculatorDays until Christmas, a holiday or any date, with a live countdown.
- Time Zone ConverterA time in one zone in another — Eastern, Pacific, world cities.
- Day of the Year CalculatorToday's date, day of the year, week number and days left.
- Day of the Week CalculatorWhat day of the week any date was or will be.
- Week Number CalculatorISO week number of any date, and its dates.
- Julian Date CalculatorYYDDD date code and astronomical Julian Date.
- Sunrise Sunset CalculatorSunrise, sunset and day length for any date.
- Daylight Saving Time CalculatorWhen US clocks change, any year.
- Military Time Converter24-hour military time to AM/PM and back, with a chart.
- Unix Timestamp ConverterEpoch time in seconds or milliseconds to a date and back.
- Leap Year CalculatorIs it a leap year? The next and previous ones.
- Easter Date CalculatorWestern and Orthodox Easter by year.
- CalendarAny year's calendar with US federal holidays, ready to print.
- Moon Phase CalculatorMoon phase, illumination and next full moon.
- Sun Angle CalculatorSun elevation, azimuth and shadow length for any place and time.
- Meeting Time PlannerBest meeting time across 2 to 4 time zones, with shared working hours.
- Life in Weeks CalculatorWeeks lived, weeks left and the Saturdays and summers ahead.
- Jet Lag CalculatorDays to adjust after crossing time zones.
- Nth Weekday of the Month Calculator4th Thursday, last Monday, US holiday dates by rule.
- Hebrew Date ConverterGregorian to Hebrew date and back, with Jewish holidays.
- Hijri Date ConverterGregorian to Islamic date and back, vs Umm al-Qura.
- Season Start CalculatorExact time of equinoxes and solstices, season lengths.
- Daylight Saving Time Dates by RegionClock changes in the US, Europe, Australia, New Zealand.
- Friday the 13th CalculatorEvery Friday the 13th, or the years your date hits a weekday.
- Screen Time Life CalculatorHours and years of screen time over a lifetime.