Time and Date Calculators
Calculators for working hours, dates, ages and time conversions. Every result shows how it was worked out.
- Time Duration CalculatorExact time between two dates and times.
- Add Time CalculatorSum durations or add time to a clock time.
- Subtract Time CalculatorSubtract durations or time from a clock time.
- Time Unit ConverterSeconds, minutes, hours, days, weeks and years.
- Age CalculatorExact age in years, months and days.
- Date Difference CalculatorDays, weeks, months and weekdays between dates.
- Days Until a DateHow many days until any date.
- Days Since a DateHow many days have passed since a date.
- Day of the Week CalculatorWhich weekday any date falls on.
- Week Number CalculatorISO week number for any date, and back.
- Leap Year CalculatorIs a year a leap year? Next and previous ones.
- Pace CalculatorPace per km and mile, speed and race times.
- Overtime CalculatorRegular, overtime and double-time pay.
- Time Card CalculatorWeekly timesheet totals in h:mm and decimal.
- Hours CalculatorHours between two times, minus breaks.
- Minutes to HoursMinutes to decimal hours and h:mm.
- Hours to MinutesHours (including decimals) to minutes.
- Seconds to HoursSeconds to h:mm:ss and decimal hours.
- Decimal to TimeDecimal hours like 7.75 to 7:45.
- Time to DecimalHours and minutes like 7:45 to 7.75.
- Average Time CalculatorThe mean of several times or durations.
- Elapsed Time CalculatorTime between a start and end clock time.
- Time and a Half CalculatorOvertime pay at 1.5× your regular rate, or any multiplier.
- Days Left in YearDays remaining until 31 December.
- Days Passed in YearDays elapsed since 1 January.
- Age Difference CalculatorThe age gap between two people.
- Half Birthday CalculatorThe date exactly 6 months after a birthday.
- Anniversary CalculatorYears since a date, and the next anniversary number.
- Business Days CalculatorWeekdays between two dates, no holiday calendar applied.
- Military Time Converter12-hour AM/PM time to 24-hour and back.
Calculation methods
Date calculators count calendar days using midnight-to-midnight intervals, so daylight saving changes never add or remove an hour from a "day". Leap years follow the Gregorian rule: divisible by 4, except century years not divisible by 400.
Hour and time-card calculators treat an end time earlier than the start time as an overnight shift. Decimal hours are rounded to the nearest second when converted back to hours and minutes.