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What is Days Between Dates Calculator?

Free days between dates calculator. Enter two dates to instantly see the difference in days, weeks, months, and years. Count business days too. No signup.

No file uploadsNo tracking of inputsNo account requiredWorks offline after first load

Date Difference runs entirely in your browser using JavaScript (browser). Your data never leaves your device.

Free Days Between Dates Calculator

Find the exact number of days, weeks, months, or years between any two dates. Use it to calculate project deadlines, contract durations, age in days, days until an event, or time elapsed since a past date. Toggle business-days-only mode to count weekdays and skip weekends. All calculations run instantly in your browser.

Free to embed on your website · No signup required

Days until 2026-07-27

90

calendar days

Weeks

12w 6d

Years

< 1

Months

2

Calendar days

90

2 months, 29 days

All calculations run in your browser. No data is sent to any server.

Free to embed on your website · No signup required

Frequently Asked Questions

The tool computes exact calendar months and years, accounting for different month lengths and leap years. Days leftover that don't complete a full month are shown separately.
In business-days mode the calculator counts Monday through Friday and skips Saturday and Sunday. It does not exclude public holidays, as these vary by country.
Yes. Set the start date to today (use the "Today" button) and the end date to your future event. The result shows exactly how many days remain.
The calculator shows the absolute difference — the sign (past vs. future) is indicated in the result label, not by a negative number.
Yes. The calculation uses your browser's native Date object, which correctly handles leap years, daylight saving time, and month-length differences.

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When to Use a Date Difference Calculator

Counting days between dates comes up constantly in business, legal, HR, and personal contexts. Project managers calculate sprint durations and delivery deadlines. HR professionals compute notice periods, probation lengths, and tenure. Lawyers count days for statutes of limitations and contract terms. Landlords and tenants calculate lease durations. Individuals track pregnancy due dates, countdowns to events, or how long ago something happened. The business-days mode is particularly useful when weekends are excluded from contractual timelines.

Calendar Days vs. Business Days

Calendar days count every day including weekends and public holidays. Business days (also called working days) count only Monday through Friday. A 30-calendar-day period contains roughly 21–22 business days depending on how many weekends it spans. The business-days mode in this calculator counts Mon–Fri only and does not subtract public holidays, as these vary by country, state, and industry. For official legal or contractual calculations, always confirm with the relevant jurisdiction's rules.

How Months and Years Are Calculated

The "years, months, days" breakdown uses calendar arithmetic rather than simple division. For example, from January 31 to March 1 is 1 month and 1 day (in non-leap years), not 29 days ÷ 30.44 days/month. This matches how humans naturally think about durations and how most legal and HR documents define periods like "2 months' notice" or "1 year probation".