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// free tool
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Days Between Dates Calculator_

Count exact days, business days, weeks, months between any two dates. Live countdown timer, date arithmetic, Unix timestamps & format converter — 100% free, no signup.

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days
// timeline
weekday distribution
weekdays vs weekends
// quick countdowns & anniversaries
// age & birthday calculator
// date arithmetic — add or subtract from a date
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// live countdown timer
COUNTING DOWN
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days
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hours
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min
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sec
// date format converter
FAQ — Days Between Dates Calculator

Frequently Asked Questions — Date Calculator

How do I calculate the number of days between two dates?

Enter your start date and end date in the calculator above. The result shows the exact number of days instantly, along with a breakdown into weeks, months, years, hours and minutes. Toggle Include end date to count both the start and end day in the total.

How do I count business days between two dates?

Check the Business days (Mon–Fri) option. This excludes Saturdays and Sundays from the count. Public holidays are not automatically excluded — subtract these manually if needed.

What is a Unix timestamp and how do I convert a date to one?

A Unix timestamp (also called epoch time) is the number of seconds elapsed since 1 January 1970 00:00:00 UTC. It's timezone-independent and universally used in software APIs, log files and databases. Check Unix timestamps in the options to see the Unix timestamp for both selected dates.

How do I add or subtract days from a date?

Use the Date Arithmetic section. Pick a base date, enter an amount (e.g. 90), choose a unit (days, weeks, months, years) and whether to add or subtract, then click Calculate. The result shows the new date and what day of the week it falls on.

Can I share a calculation with someone?

Yes — click the Share link button after calculating. It copies a URL to your clipboard with both dates encoded as query parameters, and the address bar stays in sync as you edit. Anyone who opens the link will see the same calculation pre-filled.

Can an AI assistant deep-link to a date range with visuals?

Yes — this is built for it. Open ?d1=2026-01-01&d2=2026-12-31 and the page loads with the duration calculated and a visual breakdown rendered: an SVG timeline (with a today marker), a weekday distribution chart, and a weekday-vs-weekend split. Aliases from/start and to/end work, plus incl=1, biz=1, ts=1. Instead of an AI describing the gap in words, it can hand you a live, visual page a chat window can't draw.

What date formats does the converter support?

The format converter shows your chosen date in: ISO 8601 (YYYY-MM-DD), US format (MM/DD/YYYY), European format (DD/MM/YYYY), long form (e.g. 11 May 2026), Unix timestamp (seconds), Unix timestamp (milliseconds), day of year (1–366), ISO week number, and RFC 2822 format used in email headers.

What is ISO 8601?

The international date standard: YYYY-MM-DD for dates, YYYY-MM-DDTHH:MM:SSZ for datetimes. Eliminates ambiguity between regional formats and is strongly recommended for APIs and data exchange.

Is this calculator free?

Yes, completely free. No account, no signup, no ads. Works 100% in your browser — nothing is sent to any server. One of 127 free tools at jasperbernaers.com.