Calculator

Choose two dates to calculate the exact difference between them. You can compare whole calendar dates and optionally include both the start and end date in the count.

Inputs

Start date

The earlier date in the comparison.

End date

The later date in the comparison.

Counting mode

Inclusive mode adds 1 day to the total date count.

Date order

Auto-order prevents negative totals when the dates are reversed.

Results

Total days

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Weeks + days

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Calendar difference

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Approx. months

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Metric	Value	Notes

Tip: Total days and calendar difference are related, but not the same thing. Calendar difference focuses on years, months, and days.

How it works

This calculator measures the difference between two calendar dates. It shows the gap in total days, weeks and days, and also as a calendar breakdown in years, months, and days.

Total day count
End date − Start date

Inclusive day count
(End date − Start date) + 1

Why can total days differ from months and years?

Because months have different lengths. Calendar difference shows the human-style gap, while total days shows the raw day count.

What does inclusive counting mean?

Inclusive counting includes both the start date and end date as part of the total.

What if I enter the dates backwards?

Auto-order mode swaps them for you. Strict mode preserves the order you entered and may show a negative total day count.

Related: Days Until Calculator