Date & Time Calculators

Work out durations, ages, deadlines, working days and time differences.

Calendar arithmetic is easy to get wrong by one day. The days between dates calculator counts the gap between two dates, the add days calculator moves a date forward or back, and the age calculator gives an exact age in years, months and days. The working days calculator skips weekends so a deadline counts only business days.

For clock time, the time calculator adds and subtracts hours and minutes, the hours between times calculator finds a shift length, and the work hours timesheet calculator totals a week of shifts. The sleep calculator suggests bedtimes based on 90-minute cycles. Holidays differ by country and sometimes by region, so check any important deadline against your own calendar before relying on a count of days.

Popular date & time calculators

• Days CalculatorDays, weeks and months between any two dates.
• Age CalculatorExact age in years, months and days from a birth date.
• Business Days CalculatorBusiness days between two dates, weekends excluded.
• Time CalculatorAdd and subtract hours, minutes and seconds.

All date & time calculators

• Hours CalculatorEnter a start time, an end time and an optional break to get the time in between as hours and minutes, decimal hours and total minutes. A second mode handles two full dates with times.
• Age CalculatorPick a starting point (a birth year, a full date of birth, or a known age) and the calculator works out the rest. With a full date you get an exact age down to the day.
• Days CalculatorUse the days calculator to find how many days lie between two dates, or to add days to a date and see the result with its day of the week. Weekdays, weeks and months are reported too.
• Sleep CalculatorEnter the time you need to wake up and get a bedtime that fits whole sleep cycles, or enter your bedtime and get matching wake-up times. Age group, time to fall asleep and cycle length are adjustable.
• Time Card CalculatorPick a period of one to 31 days, enter when you clocked in, clocked out and how long you took for breaks, and the calculator totals your hours. Add an hourly rate and an overtime rule to see regular, overtime and gross pay.
• Business Days CalculatorCount how many working days fall between two dates, or find the date that lies a set number of business days from a start date. Weekends are always skipped, and you can add national public holidays for four countries.
• Add Days CalculatorPick a start date, enter how many days to add, and get the new date together with its day of the week. A negative number counts backwards.
• Time CalculatorUse the clock calculator to see what time it will be after adding or removing hours, minutes and seconds, or the date and time calculator to move a whole timestamp forwards or backwards.