How does the Days Between Dates work?

Convert both dates to milliseconds since epoch Then: Subtract start from end date in milliseconds Then: Divide by 86,400,000 (ms per day) Then: Result is the absolute number of calendar days.

Can you give an example of how to use the Days Between Dates?

Example: Input Jan 1 to Dec 31 same year gives a result of 364 days (365 in a leap year).

Is the Days Between Dates free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Days Between Dates?

Our Days Between Dates uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Days Between Dates

Start Date

End Date

A days between dates calculator counts the exact number of calendar days separating two dates. It can also express the difference in weeks and months for longer time spans.

Symbol	Name	Unit	Description
start	Start date	date	Beginning date (YYYY-MM-DD)
end	End date	date	Ending date (YYYY-MM-DD)
days	Days between	days	Total calendar days elapsed

Month	Days (normal)	Days (leap year)
January	31	31
February	28	29
March	31	31
April	30	30
June	30	30
December	31	31

References

›Gregorian calendar — ISO 8601

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Days Between Dates