For questions about the date parameters/values as used by the API and their format. Use this tag as well for questions about dates found in the UI of an SE site if you have a script or app that leverages those dates.
The date format used in the API is seconds since 1970. Question about conversion from Unix epoch to a proper date in your preferred tool stack is better asked at Stack Overflow.
Use this tag for questions where the functional use of the date in the API call or its return values is unclear, buggy, etc.
