Date & Time Calculators
Count days, weeks and months between dates, add time to a date, total up hours worked or convert between time zones. Calendar maths is done on whole dates, so leap years, month ends and daylight-saving changes never shift a result by a day.
Each calculator explains which counting rule it uses, such as whether the end date is included, so you can match the convention you need.
Dates and ages
- Age Calculator Your exact age in years, months and days, plus birthday countdown.
- Days Between Dates Calculator Count the days between two dates, plus weeks, months and years.
- Date Calculator Add or subtract days, weeks, months or years from any date.
- Days Until Calculator Count down the days to any date or holiday.
- Business Days Calculator Count working days between dates, or add business days.
- Day of the Week Calculator Find the weekday for any date, past or future.
- Week Number Calculator Find the ISO week number of any date, or a week’s dates.
Time and clocks
- Hours Calculator Hours and minutes between two times, including overnight shifts.
- Time Card Calculator Add up a week of hours, breaks, overtime and pay.
- Time Calculator Add or subtract hours, minutes and seconds, or from a clock time.
- Time Zone Converter Convert a date and time between any two time zones.
- Unix Timestamp Converter Convert Unix (epoch) time to a date, and back again.
- Military Time Converter Convert 12-hour times to military time and back, one or many.
- Sunrise and Sunset Calculator Sunrise, sunset, day length and twilight for any place and date.