How it works
Signed calendar days = (UTC end − UTC start)/86,400,000; optional inclusive end
Input definitions
- Start date
- A complete Gregorian calendar date.
- End date
- A complete Gregorian calendar date.
- Count end date?
- Choose No / Yes.
A worked example
- Start date
- 2024-02-28
- End date
- 2024-03-01
- Count end date?
- No
Assumptions & limits
Gregorian calendar dates at UTC midnight. Calendar-day arithmetic, not local elapsed hours. No holidays. End date excluded unless an inclusive option is selected.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Do daylight-saving changes affect calendar date results?
Date-only operations compare Gregorian calendar dates at UTC midnight. They do not count local elapsed hours. Timestamp operations require an explicit offset; individual tool assumptions state boundary rules.
How does the Date difference tool work?
Signed calendar days = (UTC end − UTC start)/86,400,000; optional inclusive end.
What are the assumptions and limits of Date difference?
Gregorian calendar dates at UTC midnight. Calendar-day arithmetic, not local elapsed hours. No holidays. End date excluded unless an inclusive option is selected.