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