Free Date Duration Calculator
A free date duration calculator finds the time between any two dates — in years, months, days, total days, and weeks. Pick a start and end date and results update instantly in your browser. No signup needed.
Select a start date and end date to see the exact calendar duration between them — years, months, days, plus total days, weeks, and hours. Useful for project timelines, contracts, travel planning, and eligibility windows. Calculates locally in your browser. Free, no signup.
Runs 100% in your browser. Your data never leaves your device.
Calendar arithmetic with native JavaScript Date objects — no external date libraries, all calculations local.
How to Use Date Duration Calculator
- Select the start date using the first date picker
- Select the end date using the second date picker
- View calendar duration in years, months, and days
- See total days, weeks, and hours in the summary below
When Would You Use This?
Project managers scoping sprints paste contract start and delivery dates to see exact day counts without opening a spreadsheet.
Tenants checking lease terms compare move-in and move-out dates to verify notice periods match what was agreed.
Anyone waiting on a visa or permit renewal counts days between submission and expected decision — calendar months matter when deadlines are phrased that way.
Frequently Asked Questions
- Is this date duration calculator free to use?
- Yes, completely free. No signup, no login, no payment ever.
- Do I need to create an account?
- No account needed. Open the tool and start using it immediately.
- Is my data safe?
- Everything runs in your browser. Your dates are never uploaded to our servers.
- What if the end date is before the start date?
- The tool swaps the dates automatically and shows the duration between them. A note appears so you know the order was reversed.
- Does it count leap years?
- Yes. Calendar duration uses actual month lengths and leap years. Total days are based on calendar dates, not fixed 30-day months.