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Date Calculator

Count the days between two dates, including weekdays, or add and subtract days, weeks, months and years from a date.

  • Free
  • Instant results
  • Runs in your browser
In short

Pick two dates to count the days between them (and how many are weekdays), or switch to ‘Add or subtract’ to find the date a number of days, weeks, months or years away.

Date Calculator: frequently asked questions

How many days are between two dates?
Subtract the earlier date from the later one. The result excludes the end date; add 1 if you want to count both the start and end days.
How are business days counted?
Weekdays (Monday to Friday) between the two dates are counted; public holidays are not excluded.
What happens when adding a month to 31 January?
JavaScript date rules roll over to early March in non-leap years (31 Feb doesn't exist), so check month-end results.