Date Calculator
Add days, count the gap, or skip the weekends.
Use a non-negative whole number. The starting date is not counted. Choose Subtract to go back.
Choose the dates to see your result.
Date math, without counting calendar squares
Use this free online date calculator to add days to a date, subtract days from a date, or count days between dates. Choose weeks, months, or years when that fits your plans. Results update as you change the inputs, and everything is calculated in your browser.
Date calculator FAQ
What date is 90 days from today?
In Add / Subtract, keep the starting date set to today, enter 90, choose Days and Add. Change the amount to find any number of days from today. Today comes from your device's local calendar date; choose Subtract to look back instead.
What happens at the end of a month?
Month and year calculations keep the day number when possible. If it does not exist in the target month, the calculator uses that month's last day: January 31 plus one month becomes February 28, or February 29 in a leap year.
How are days between dates counted?
Ranges count from the earlier date to the later date, including the earlier date and excluding the later date by default. Select Include end date to count both. Reversed inputs give the same non-negative total. Identical dates count as zero days, or one with the end date included.
Can I count weekdays between dates?
Yes. In the Business Days calculator, choose Business days between dates to count Monday through Friday. Business days exclude weekends. Holidays are not excluded. Ranges use the same end-date option as calendar days. Adding or subtracting business days skips the starting date; zero leaves it unchanged.
Planning a project? Try the project name generator for a fresh name. Choosing an activity for that date? Let Spin the Wheel pick from your options.