Date Difference Calculator
Runs in your browser — your data is never uploaded.
Find exactly how many days fall between two dates, also broken down into weeks and days — useful for counting down to a deadline, measuring a project’s length, or checking a notice period. The result updates instantly as you change either date.
How to use Date Difference Calculator
- 1
Enter the start date.
- 2
Enter the end date.
- 3
The result updates automatically.
Share
Embed this tool on your site
Paste this where you want the tool to appear. It runs entirely in your visitor's browser — no uploads, no account, no tracking.
Please keep the attribution line — it's what keeps these tools free.
Need a different size, a dark theme, or a different tool? Build an embed lets you preview it first.
Frequently asked questions
Does the count include both the start and end dates?+
It measures the gap between the two dates, so the start date itself isn’t counted as a full day — the difference between a Monday and the next Monday is 7 days, not 8. Add one if you need to count both endpoints inclusively.
Does it account for leap years?+
Yes. The calculation uses real calendar dates, so any 29 February that falls within the range is counted automatically.
What if the end date is before the start date?+
The result still shows the number of days between them, noting that the end date is earlier than the start date.
Is my data uploaded anywhere?+
No. The calculation runs entirely in your browser — nothing is sent to a server.