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Date Difference

Days, weeks, months and years between two dates.

Days = end − start, counted as UTC calendar days. Calendar months count full month boundaries; the remainder becomes extra days.

Are the start and end dates counted?
The difference is end minus start, so Jan 1 to Jan 2 is 1 day. The start date is excluded and the end date included.
How are leap years handled?
Calendar arithmetic follows the Gregorian calendar, so Feb 29 exists in leap years and day differences are exact.
Can I count weekdays only?
Not yet — this tool counts calendar days. A business-day counter is a possible future tool.

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