Day Counter – Count Days Between Two Dates Online
Count the days between two dates, including the start day if you wish.
About the Day Counter
What is the Day Counter?
A day counter tells you how many days lie between two dates, optionally including both the start and end dates.
Why use this calculator?
Whether you are tracking a project deadline, a countdown or a return window, knowing the exact number of days avoids off-by-one mistakes.
How to use it
- Enter the start and end dates.
- Choose whether to count the start day.
- Read the day count and the number of weekdays.
Formula
The difference is the end date minus the start date, in whole days.
"Inclusive" adds one day so both endpoints are counted.
Frequently Asked Questions
Should I count the start day?
It depends on context. Event planning often includes both endpoints, while deadline calculations usually count the days between.
How are weekdays counted?
Every Monday through Friday between the two dates is counted, regardless of public holidays.
Does it account for leap years?
Yes. The date logic follows the Gregorian calendar, including leap years and differing month lengths.
Are weekends and holidays excluded?
Only if the calculator says so. By default, results count every calendar day; use a business-day option where available.
Which time zone is used?
Calculations use whole calendar dates and are time-zone independent unless a time-of-day is involved.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.