DTV13 — Clause 10.5 should be in Clause 13

Clause 10.5 (Time zones) deals entirely with time-of-day issues and defines important time-of-day concepts. It defines time zones as distinct calendars, but that does not make the content about calendars in general. The entirety of the clause should be moved to clause 13 (time of day).

Move clause 10.5 to clause 13 and address DTV13-105

The RTF agrees that the content of clause 10.5 (time zones) is more appropriate to clause 13 (time of day). The text of 10.5 is also somewhat disorganized in presenting the concepts. The text is moved and reorganized with minor editorial changes. It was noted that one concept in the UML diagrams (time of day scale) is not documented in the text, and one concept used in the text (locale) is not in the diagram. These disalignments are also corrected.

The RTF agrees with Issue 13-105, that 'time offset' is not just a role of duration – it is the characterization of a difference between a calendar and UTC that involves a direction (ahead of or behind UTC) and a duration. The verb that introduces the term – calendar1 differs from calendar2 by time offset – actually refers to a role of 'duration' but 'differs from' is an ambiguous wording. It is replaced by 'calendar1 is duration ahead of calendar2', with the same synonymous forms using + and -. 'time offset' then characterizes the difference as 'ahead' or the inverse 'behind' together with the duration. The resolution of Issue 13-105 revises the concept ‘time offset’ and corrects the formal text that uses it.

Because Issue 13-105 modifies the text being moved, the revised text is included in the resolution of issue 13-101.