Date Difference Calculator
Count days, weeks, and whole months between two calendar dates.
Browser onlyYour data never leaves this device.
Runs entirely in your browser. Your dates never leave this device and are never stored.
Details: Privacy policy
Inputs
Gregorian calendar, UTC. End dates before the start are rejected.
Result
No dates yet.
Enter start and end dates above.
Date Difference Calculator measures the exact gap between two calendar dates, expressed as total days, as weeks with a remaining-days count, and as whole calendar months. It suits people counting down to a deadline, verifying a contract's term, or working out how many days a project allowance covers. The count follows the proleptic Gregorian calendar in UTC and uses whole calendar months rather than thirty-day blocks, so 15 January to 14 February is zero months while 15 January to 15 February is one. An end date that falls before the start date is refused with a message instead of being silently reversed, and leap days are included in the total. All arithmetic runs in the browser, so sensitive dates such as departure or termination dates stay on your device. Inclusive counts, where both the opening and closing day matter, are not offered here; subtract a day when your definition includes the endpoint. Weeks arrive with leftover days rather than decimal fractions, which keeps the reckoning obvious on a calendar. Printing the interval is not offered, so copy the line you need. A count of working days is outside its scope, because public holidays differ from one country to the next. Both dates use the same calendar picker, so adjusting either one re-measures the interval at once. Whole calendar months rather than thirty-day blocks, and the arithmetic follows the proleptic Gregorian calendar in UTC, ignoring leap seconds and local zones. The output distinguishes days, weeks and whole months, and because the calendar is proleptic Gregorian in UTC, a date before the Gregorian reform is still computed by the same rules.
How to use Date Difference Calculator
- Enter the start and end dates.
- Read the days, weeks, and months breakdown.
- Copy the summary or clear to start over.
What you get
- The interval as total days, weeks with remaining days, and whole calendar months.
- A copyable summary of the measured span.
- Leap-day-inclusive totals computed in UTC.
When to use Date Difference Calculator
- Count down the days until a deadline or event.
- Verify contract durations between start and end dates.
- Work out how many weeks a fixed project window contains.
Frequently asked questions about Date Difference Calculator
Does Date Difference Calculator upload my dates?
No. All calculation runs locally in your browser; nothing is sent, stored, or logged.
What counts as a month?
Whole calendar months. From January 15 to February 14 is zero months; to February 15 is one.
Can the end date come first?
No. An end date before the start date is rejected with a message instead of guessing.
Are leap days included?
Yes. Day totals count every calendar day, including February 29 in leap years.
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