Date Difference Calculator
Calculate the number of days, weeks or months between two dates — or just business days.
Calculated locally in your browser using your device's date and time.
- Same span shown four ways — days, weeks, months and years.
- A business-days-only mode excludes weekends, and optionally specific holiday dates you list — for "30 business days" contract terms, which is a genuinely different number of calendar days.
- Exact calendar maths, so month lengths and leap years are handled.
- Runs in your browser; the dates aren't uploaded.
Why this is private
- Calculated locally in your browser using your device's date and time.
- Open your browser's DevTools → Network tab while using this tool — you won't see a request carrying your input, because it never leaves your device.
- Nothing you enter is uploaded to a server or shared with us — the processing happens entirely on your device.
Overview
Calculates the exact duration between two dates in days, weeks, months and years — or switch to business-days-only mode to exclude weekends (and optionally specific holidays) for deadline and contract-period counting.
How to use it
- 1Enter a start date and an end date.
- 2View the difference in multiple units.
- 3Turn on "Business days only" to exclude weekends, optionally listing specific holiday dates to exclude too.
Frequently asked questions
What people use it for
Count down to a deadline or eventSee exactly how many days are left until a submission date.
Work out a notice or contract period in business daysTurn on business-days-only mode to measure a "30 business days" notice period correctly, not as 30 calendar days.
Calculate days for a claim or invoiceGet the day count between two dates for interest, leave or billing.
Check a project durationConvert a start-to-finish span into weeks for planning.
Related tools
All date & time toolsAge CalculatorCalculate exact age in years, months and days from a birth date, plus the total in weeks, hours, minutes and seconds.Add / Subtract Date CalculatorAdd or subtract days, weeks, months or years from a date — with an optional business-days mode.Day of the Week FinderFind what day of the week any date falls on.Timezone ConverterConvert a time between two or more timezones at once.
Ready to use Date Difference Calculator?
Date Difference Calculator