Calculators · SIMPLY USEFUL
Date Calculator
Take the guesswork out of dates.
Choose valid dates to see your result.
Differences count elapsed calendar days and exclude the end date. Leap years and varying month lengths are included.
A little less friction in your day.
Find the space between two dates, or move a date forward or backward by a chosen number of days.
How to use date calculator
- Select Difference, Add days or Subtract days.
- Enter the date or date range.
- Read the calendar result, including whole weeks and months where relevant.
Good to know
Are leap years handled?
Yes. Calculations follow the ISO/Gregorian calendar, including February 29 in leap years.
Is the end date included?
No. The result is elapsed calendar days. For example, October 1 to October 2 is one day.
Is one month always 30 days?
No. Calendar years and months are calculated using their actual dates and lengths.