Give an example of a date/time in ISO 8601 format.

• A. 2023-09-01T13:05:53Z
• B. 09/01/2023 1:05 PM
• C. 2023-09-01 13:05:53
• D. 01-09-2023T13:05:53Z

Answer: (A)

ISO 8601 uses a clear, sortable date/time form: YYYY-MM-DDThh:mm:ss with an optional time zone designator. The example 2023-09-01T13:05:53Z uses year-month-day, a T separator, a 24-hour time, and Z to mark UTC, which is exactly the standard form. The other formats don’t fit ISO 8601: using slashes and a 12-hour clock with AM/PM; using a space instead of T to join date and time; or mixing day-month order (01-09-2023) which isn’t year-month-day. So this is the correct ISO 8601 date/time representation.