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Numio

Date Difference Calculator

Count calendar days between two dates, with an option to include both endpoints. Leap years are handled automatically.

Mode

Input

Result (days)

Type or paste on the left — the result updates as you type.

Uses Gregorian calendar dates at UTC midnight, avoiding daylight-saving changes. Inclusive mode requires the end date to be on or after the start.

Up to 100,000 UTF-16 units per input and 1,000,000 per result. See the supported formats and examples below.

Format references

Tool page updated: