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Date Difference Calculator

Find out exactly how many days, weeks, months, or years are between any two dates.

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Your result

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How it works

About this calculator

Need to know how many days until a big event? Or how long since something happened? Our date difference calculator tells you exactly how much time is between any two dates. The result shows days, weeks, months, and years — whichever format is most useful for you. No more counting on your fingers or checking calendar apps.

The formula, explained simply

We calculate the absolute difference between two dates in milliseconds, then convert to days, weeks, months, and years. The months calculation properly accounts for different month lengths. The years calculation divides months by 12 and shows remaining months. The result is always positive — we find the time between the dates regardless of which comes first.

When you would use this

Event planners count days until weddings or conferences. Parents track how old their children are in months for milestone tracking. Project managers calculate durations for timelines. People count down to vacations, birthdays, or retirement. Anyone filling out forms that ask for your "age in years and months" gets the exact answer.

Frequently asked questions

Does this include the start and end date?
The calculation counts the full 24-hour periods between the two dates. It does not include the start date itself.
How accurate is the months calculation?
It is very accurate — we use proper calendar math accounting for different month lengths. January 15 to March 15 is exactly 2 months.
What order do the dates go in?
The calculator works either way — it always returns a positive number representing the time between dates.
Can I use this for age calculation?
Yes, but our dedicated Age Calculator and Birthday Age Calculator provide more detailed age breakdowns including years, months, and days.
Does this handle leap years?
Yes, the date difference calculation accounts for February 29 in leap years automatically.

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AstroCode

Build your website for free — pay 99$ monthly

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