English interface
Date difference calculator
Count Gregorian calendar days with an optional inclusive end date.
ReviewedModerate-impact
Saves this tool's name on this device only (up to 20). No form values.
Only visible result text is included. Form fields are not read. Review sensitive values before sharing.
How to use it
- Choose valid C.E. start and end dates.
- Choose whether to include the end date.
- Calculate the interval.
Important limitation
This is date-only arithmetic. It does not determine legal deadlines, holidays or business days.
The interactive form is fully localized in English.
Reviewed 2026-09-09; next review 2027-03-09.
Core calculations, cited sources and main test cases have been reviewed within the stated scope.
Traceable review record
Site changelogReview history
This is the recorded review history available in the repository, not an inferred release history. Dates are added only when evidence is recorded.
- Current review snapshot recorded
Core calculations, cited sources and main test cases have been reviewed within the stated scope.
Method version: review-2026-09-09