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CLDR-18280 Add time zone offset symbol that doesn't use gmtZeroFormat #4347

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CLDR-18280 Add time zone offset symbol that doesn't use gmtZeroFormat #4347

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9 changes: 7 additions & 2 deletions docs/ldml/tr35-dates.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1706,12 +1706,16 @@ Note: A generic location format is constructed by a part of time zone ID represe
* "UTC-3" (short)
* "Гринуич+03:30" (long)

Otherwise (when the offset from GMT is zero, referring to GMT itself) the style specified by the `<gmtZeroFormat>` element is used:
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Actually I don't agree with the assumption that a zero GMT offset refers to GMT itself. Azores Summer Time is GMT+0, but that doesn't make it GMT, it's still Azores Summer Time, just with a GMT offset of zero. I would actually prefer if this format never used the gmtZeroFormat and we wouldn't need to introduce a new format for this behaviour.

For the short and long formats, there's a special element for the zero offset (`<gmtZeroFormat>`):

* "GMT"
* "UTC"
* "Гринуич"

The fixed-length format does not use this element:

* "GMT+00:00"

**ISO 8601 time zone formats:** The formats based on the [[ISO 8601](tr35.md#ISO8601)] local time difference from UTC ("+" sign is used when local time offset is 0), or the UTC indicator ("Z" - only when the local time offset is 0 and the specifier X\* is used). The ISO 8601 basic format does not use a separator character between hours and minutes field, while the extended format uses colon (':') as the separator. The ISO 8601 basic format with hours and minutes fields is equivalent to RFC 822 zone format.

* "-0800" (basic)
Expand Down Expand Up @@ -2286,7 +2290,8 @@ Notes for the table below:
The ISO8601 UTC indicator "Z" is used when local time offset is 0.
This is equivalent to the "XXXXX" specifier.</td></tr>
<!-- O -->
<tr><td rowspan="2">O</td><td>O</td><td>GMT-8</td><td colspan="2">The <i>short localized GMT format</i>.</td></tr>
<tr><td rowspan="3">O</td><td>O</td><td>GMT-8</td><td colspan="2">The <i>short localized GMT format</i>.</td></tr>
<tr><td>OO</td><td>GMT-08:00</td><td colspan="2">The <i>fixed-length localized GMT format</i>.</td></tr>
<tr><td>OOOO</td><td>GMT-08:00</td><td colspan="2">The <i>long localized GMT format</i>.</td></tr>
<!-- v -->
<tr><td rowspan="2">v</td><td>v</td><td>PT</td>
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