Date Diff Calculator
TimeCalculate the difference between two dates in years, months, weeks, and days
Pick a start and end date and get the difference broken down into years, months, weeks, and days, plus the raw total in days alone, useful for calculating an exact age, a project's duration, or how long remains until a deadline. It's built on the native JavaScript Date object, so leap years and variable month lengths are handled correctly without any special-casing on your part. By default it compares calendar dates rather than exact moments in time; if time-of-day and timezone offsets matter for your calculation (say, comparing two log timestamps from different regions), pair it with the Timezone Converter tool rather than relying on this one alone. All the math runs locally in your browser.
How to use Date Diff Calculator
- 1.Pick a start and end date to get the exact difference broken down into years, months, weeks, and days.
- 2.Use it to calculate someone's exact age, a project's duration, or how many days remain until a deadline.
- 3.Compare two timestamps from a log file to quickly sanity-check an elapsed-time calculation in your code.
Frequently asked questions
Use via API, SDK, or MCP
cURL# Free: 1,000 req/day · Pro: 10,000 req/day
curl -X POST https://api.utilix.tech/v1/tools/date-diff \
-H "Authorization: Bearer utx_live_..." \
-H "Content-Type: application/json" \
-d '{"from":"2024-01-01","to":"2026-06-27"}'Get an API key from your dashboard · Full API docs →