CALCULATORS
Date Calculator
Find the number of calendar days between dates, or calculate a future or past date by adding or subtracting whole days.
Choose a start and end date to find the difference.
Calculated instantly in your browser. Your dates are not uploaded.
How to use the date calculator
Choose “Days between dates” to compare two calendar dates. The result is signed: it is positive when the end date is later and negative when the end date is earlier. Choose “Add or subtract days” to enter a starting date and a whole-day offset; use a negative number to count backwards.
Calendar days, not elapsed hours
Results count calendar dates and do not depend on the time of day or daylight-saving changes. The difference between consecutive dates is one day. For an inclusive count that includes both endpoints, add one to a non-negative date difference.
Date calculation examples
- January 1 to January 8 is 7 calendar days.
- January 8 to January 1 is −7 calendar days.
- January 1 plus 30 days is January 31 in a non-leap year.
Calculate a duration in hours or minutes with the Time Converter, or work out percentage changes with the Percentage Calculator, calculate age on a chosen date with the Age Calculator, or edit capitalization with the Text Case Converter.