A practical example
Find the date 90 days from a start date
Choose Add or subtract, enter the starting date, set 90 days, and keep Add selected.
Date Calculator
Choose the kind of date calculation you need.
Your work stays in this browser.
Time between the two dates30 days4 weeks and 2 days
How to use the Date Calculator
Date Calculator compares two dates, moves a date forward or backward, or counts weekdays between dates. It separates calendar-day questions from business-day questions so the result is easier to interpret.
Choose a date calculation
Select Days between, Add or subtract, or Business days.
Enter the dates and options
Choose the start and end dates or the calendar amount you want to move.
Review the result
Read the exact day count, week-and-day summary, or resulting calendar date.
What to know
- Business days exclude Saturdays and Sundays but do not remove public holidays.
- The starting date is not counted in the business-day total; the ending date can be included with the option shown.
Questions people ask
Does the calculator account for leap years?
Yes. It uses real calendar dates, including leap days.
Can I subtract months or years?
Yes. In Add or subtract mode, choose months or years and select Subtract.