felipecrv commented on code in PR #48002:
URL: https://github.com/apache/arrow/pull/48002#discussion_r2560497438
##########
docs/source/format/CanonicalExtensions.rst:
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@@ -544,6 +544,33 @@ Primitive Type Mappings
| UUID extension type | UUID |
+----------------------+------------------------+
+.. _timestamp_with_offset_extension:
+
+Timestamp With Offset
+=============
+This type represents a timestamp column that stores potentially different
timezone offsets per value. The timestamp is stored in UTC alongside the
original timezone offset in minutes.
+This extension type is intended to be compatible with ANSI SQL's ``TIMESTAMP
WITH TIME ZONE``, which is supported by multiple database engines.
+
+* Extension name: ``arrow.timestamp_with_offset``.
+
+* The storage type of the extension is a ``Struct`` with 2 fields, in order:
+
+ * ``timestamp``: a non-nullable ``Timestamp(time_unit, "UTC")``, where
``time_unit`` is any Arrow ``TimeUnit`` (s, ms, us or ns).
+
+ * ``offset_minutes``: a non-nullable signed 16-bit integer (``Int16``)
representing the offset in minutes from the UTC timezone. Negative offsets
represent time zones west of UTC, while positive offsets represent east.
Offsets range from -779 (-12:59) to +780 (+13:00).
Review Comment:
```suggestion
* ``offset_minutes``: a non-nullable signed 16-bit integer (``Int16``)
representing the offset in minutes from the UTC timezone. Negative offsets
represent time zones west of UTC, while positive offsets represent east.
Offsets normally range from -779 (-12:59) to +780 (+13:00).
```
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