vy commented on issue #3885:
URL:
https://github.com/apache/logging-log4j2/issues/3885#issuecomment-3195536654
```
[Compatibility failed for pattern: 'ISO8601_OFFSET_DATE_TIME_HH']
expected: "2025-08-17T12:10:08,887+0530"
but was: "2025-08-17T12:10:08,887+05"
```
`NamedInstantPattern.ISO8601_OFFSET_DATE_TIME_HH` is defined as follows:
```
ISO8601_OFFSET_DATE_TIME_HH("yyyy-MM-dd'T'HH:mm:ss,SSSx",
"yyyy-MM-dd'T'HH:mm:ss,SSSX")
```
Note the 2nd argument denotes the legacy pattern.
`FixedDateFormat`, delegated from `InstantPatternLegacyFormatter`, contains
the following:
```
/**
* ISO8601 time format: {@code "yyyy-MM-dd'T'HH:mm:ss,SSSX"} with a
time zone like {@code -07}.
*/
ISO8601_OFFSET_DATE_TIME_HH(
"yyyy-MM-dd'T'HH:mm:ss,SSSX", "yyyy-MM-dd'T'", 2, ':', 1,
',', 1, 3, FixedTimeZoneFormat.HH),
```
This certainly does not work, since `FixedTimeZoneFormat.HH` only encodes
hours, whereas in our case, the time zone contains minutes component. Put
another way, this is a bug in the **legacy** `FixedDateFormat`.
I'm not inclined to fix this – we deprecated legacy formatters for a reason.
@ppkarwasz, unless you've objections, I'd like to close this issue as `Not
planned`.
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