This free Date Calculator does the two date jobs everyone needs: counting the exact number of days between two dates, and finding the date that falls a set number of days before or after any date. Everything runs in your browser — no sign-up, nothing uploaded.
How to count days between dates
- Pick the start date.
- Pick the end date.
- Click Count Days Between. You get the total days, the same span in weeks and days, an approximate month count, and hours.
Use it for visa validity windows, notice periods, project deadlines, pregnancy and leave planning, or counting down to an exam or wedding.
How to add or subtract days
- Pick your starting date.
- Enter the number of days and choose Add or Subtract.
- Click Calculate Date. The result shows the full date with its weekday — handy for “90 days from today” form deadlines and “30 days before expiry” reminders.
Frequently asked questions
Does the counter include the start and end days?
It counts the difference between the two dates, the standard way date calculators work. If you need both the first and last day counted (inclusive), add 1 to the result.
Can it handle leap years?
Yes. The calculation uses real calendar dates, so 29 February is counted correctly in leap years.
What is 90 days from today?
Pick today’s date in the Add box, enter 90, and click Calculate Date.
Related tools: Age Calculator, Timestamp Converter, Percentage Calculator.
