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Date & Time Tools
5 free tools
Work out durations, business days, week numbers and date math — all the date calculations spreadsheets make painful.
Week Number Calculator
Featured
Find the ISO week number, day of year and quarter for any date.
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Time Duration Calculator
Calculate the duration between two times in hours and minutes, including overnight shifts.
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Business Days Calculator
Count working days (Mon–Fri) between two dates, excluding weekends.
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Add or Subtract Days
Add or subtract a number of days from any date to find the resulting date and weekday.
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Leap Year Checker
Check if any year is a leap year and find the next leap year.
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