Date difference
Years, months, days, and total days between two dates.
Runs in this tab. The file stays here.
This runs in your browser. Nothing is uploaded.
About Date difference
Shows the calendar span and total days between two dates, calculated in your browser.
I still open a spreadsheet for 'how many days until Friday the 13th' more often than I want to admit. Two date fields and an answer should not need Excel serial numbers or a site that keeps a history of every pair you typed.
Pick any two dates. You get years, months, and days the way a calendar counts them, borrowing from the previous month when the day numbers don't line up, plus a plain total of days between the two midnights. Swap the order; the span is the same either way.
Weekends and holidays still count. I'm not maintaining a bank-holiday table for one country, let alone fifty. If you need working days only, you need a different tool with a holiday list I won't invent. Close the tab and the dates are gone. For birthdate-to-today specifically, the age calculator is the same math with today already filled in.
How to use Date difference
- 1Set the from date and the to date.
- 2Read the calendar span and the total days.
- 3Change either date; the result updates.
What it won't do
- Calendar dates only, no time-of-day.
- No business-day or holiday calendars.
Common questions
Does date difference count both endpoints?
Total days is midnight to midnight. Monday to Tuesday is 1. The year/month/day line is the calendar span, not an inclusive ticket that adds an extra day for luck.
Are time zones considered?
No. These are calendar dates in your local zone, pinned at noon so DST doesn't shove a date across a midnight boundary. If you care about exact hours across zones, you want a timeline tool, not this form.
Can I enter a time of day as well?
No. Hours turn every answer into a timezone fight. Use dates when you mean days on a planner; use a stopwatch or a spreadsheet when you mean hours.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation