Date Calculator
Calculate days, weeks and months between two dates, or add/subtract days from any date.
What is Date Calculator
Two modes on one page: measure the exact gap between any two dates — total days, an approximated weeks/months view and a year-month-day breakdown — or add and subtract N days from a base date to land on the target date together with its weekday.
How to use Date Calculator
- Left card: pick a start and end date to see the gap
- Right card: pick a base date, add or subtract N days
- The result shows the full date with weekday
Frequently asked questions
Does the day count include both endpoint dates?
No — "days between" is a pure difference (end minus start). January 1 to January 8 gives 7 days; add 1 yourself for an inclusive count.
How exact are the weeks and months figures?
Weeks = days ÷ 7. Months = days ÷ 30.436875, an average-month approximation meant for a quick sense of scale — rely on the year/month/day breakdown for precision.
Can it count business days only?
No, every result counts calendar days without skipping weekends or public holidays. Use a dedicated workday calculator for that instead.
Is Date Calculator free?
Date Calculator is completely free — open the page and use every feature with no hidden charges.
Do I need to download or install Date Calculator?
No download or installation is needed. It is an online tool that runs in the browser on your phone, tablet and computer.
Do I need an account to use Date Calculator?
No. Use the tool right away — no account or sign-in required.
Does Date Calculator work on mobile?
Yes. The page is fully responsive and works on phones, tablets and desktop browsers.