Skip to content
KazamTools

Date & Time Calculators

Count days between dates, work out exact ages and add or subtract time without mistakes.

Age CalculatorExact age in years, months and days, on today or any cut-off date.Date CalculatorCount the days between dates, business days included, or add and subtract time.Hijri Date ConverterConvert between Hijri and Gregorian dates, with today’s Islamic date and key dates of the year.Hours CalculatorHours worked between two times, with breaks, overnight shifts, decimal hours and pay.Online TimerA countdown timer with alarm, presets and full screen, plus a stopwatch with laps.Time CalculatorAdd hours and minutes, find the time between two times, convert decimal hours and total a timesheet.Time Card CalculatorA weekly timesheet that totals your hours, overtime and gross pay.Time Zone ConverterConvert a time to several cities at once, with daylight saving time handled for you.

Guides

Count days, ages and hours without mistakes

Date arithmetic is full of traps: months have different lengths, leap years add a day, and "between two dates" can include or exclude the last day. These tools handle all of that and tell you which counting rule they use.

Find an exact age with the age calculator, count the days or business days between two dates with the date calculator, add up hours and minutes with the time calculator, or run a countdown with the online timer.

Frequently asked questions

Do the calculators handle leap years?

Yes. Leap years and month lengths are handled automatically.

Is the end date included when counting days?

By default the end date is excluded, as most date calculators do. You can switch to include it.

Can I calculate age on a specific date?

Yes. Set the "as of" date, which is useful for exam and job eligibility rules.

Does the timer work in a background tab?

Yes. It keeps accurate time and plays an alarm when it ends.