Duplicative requirements for last modified date #2662
Description
Issue on the EPUB 3.3 Recommendation
Describe the problem
The required pattern for the last modified date is stated in one paragraph to be:
YYYY-MM-DDThh:mm:ssZ
But in the very next paragraph we restate the requirements implied in the pattern:
EPUB creators MUST express the last modification date in Coordinated Universal Time (UTC) and MUST terminate it with the "Z" (Zulu) time zone indicator.
Describe the fix or new feature you propose
In the interests of not duplicating normative requirements, we could make the second paragraph an explanation of the pattern by removing the MUSTs:
The required "Z" (Zulu) time indicator at the end of the pattern means the last modification date is always expressed in Coordinated Universal Time (UTC).
(Or even make this a note.)
Edit: tweaked the proposed new wording a bit to remove a redundancy and fix a grammar error.