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2.5.5.5 Global dates and times http://www.w3.org/TR/html5/common-microsyntaxes.html#global-dates-and-times The note on time zone offsets says in part: "...and the minutes component of offsets of actual time zones is always either 00, 30, or 45." Really this is arbitrary and prone to change. The total range of time zones also changes from time to time. I would suggest inserting a "at the time this document was published" caveat such that innocent readers are not caught by surprise by a new 15 minute time zone offset or by more monkey business surrounding the IDL.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the tracker issue; or you may create a tracker issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Rejected Change Description: no spec change Rationale: The document is republished every few minutes, so that wouldn't help much. If the time zones change such that this note is wrong, we'll fix the note.
It wouldn't hurt to make the change, though. It is sometimes useful to remind people that time zones are subject to (actually quite frequent) change. A lot of implementers are blissfully unaware of that fact.
And I should add: it may be better if implementations, tests, etc. didn't assume these values were true in a hardcoded fashion.
This bug was cloned to create bug 17989 as part of operation convergence.
EDITOR'S RESPONSE: This is an Editor's Response to your comment. If you are satisfied with this response, please change the state of this bug to CLOSED. If you have additional information and would like the Editor to reconsider, please reopen this bug. If you would like to escalate the issue to the full HTML Working Group, please add the TrackerRequest keyword to this bug, and suggest title and text for the Tracker Issue; or you may create a Tracker Issue yourself, if you are able to do so. For more details, see this document: http://dev.w3.org/html5/decision-policy/decision-policy.html Status: Accepted Change Description: https://github.com/w3c/html/commit/0e427228d293f81968802c95b9b9cd8b1104817d https://github.com/w3c/html/commit/55452727eea04331381c086af24626813ceda0c4 Rationale: Add note about timezone changes
The I18N WG is satisfied by this change. Thank you.