Free Date Tool

Date Difference Calculator

Find the exact number of days, weeks, months, and years between any two dates — plus business days.

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More Than Just Counting Days

Knowing the exact difference between two dates is more useful than it sounds. Whether you're planning a project deadline, calculating how long until an event, tracking how long something has been going on, or figuring out contract terms — having a precise number matters.

Our calculator breaks it down in every unit so you always have the number you actually need, whether that's 180 days or 5.9 months or 25 weeks.

What People Use This For

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Birthdays & Anniversaries
How many days until the big day? How long have you been together?
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Project Deadlines
Exactly how many business days do you have to complete a project?
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Travel Planning
How long until your trip? How many days will you be away?
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Contracts & Leases
Calculate notice periods, contract durations, and renewal dates.
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Fitness Goals
How many days into your program are you? How far to your goal date?
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Pregnancy & Milestones
Track weeks and days from any starting date.

Why Business Days Matter

Calendar days and business days are very different things. A 10-business-day turnaround on a contract signed on a Thursday could actually span three calendar weeks once you factor out weekends. Our calculator counts both so you always know which number applies to your situation.

Note that our business days counter excludes weekends but does not account for public holidays, which vary by country and region. For precise legal or contractual timelines, always confirm with the relevant parties.

Frequently Asked Questions

Does the calculator include the start and end date?
The calculator counts the days between the two dates inclusively — meaning both the start and end date are included in the count. For example, Jan 1 to Jan 3 returns 2 days of difference.
What if I put the end date before the start date?
No problem — the calculator uses the absolute difference between the two dates, so the order doesn't matter. You'll get the same result either way.
Are public holidays counted as business days?
The business days count excludes weekends (Saturday and Sunday) but does include public holidays, since these vary by country, region, and industry. For precise legal deadlines, verify independently.
How far back or forward can I calculate?
The calculator can handle any dates supported by your browser's date input — typically ranging from the year 1 to the year 9999. It works equally well for historical dates and future dates.

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