Improve handling of no-inheritance-marker in timezone data #1194
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## master #1194 +/- ##
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+ Coverage 91.68% 91.71% +0.02%
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Files 27 27
Lines 4691 4693 +2
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+ Hits 4301 4304 +3
+ Misses 390 389 -1
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Fixes #1192 (but uncovers another bug)
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If you aren't in a rush to merge this, I will take a look later this week :) |
tomasr8
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tomasr8
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Not much of a c++ person, but the tz changes look reasonable to me 👍
| tz = timezone_getter("Pacific/Honolulu") | ||
| dt = _localize(tz, datetime(2025, 3, 4, 13, 53, tzinfo=UTC)) | ||
| assert dates.format_datetime(dt, "YYYY-MM-dd H:mm z", locale="en_US") == "2025-03-04 3:53 HST" | ||
| assert dates.format_datetime(dt, "YYYY-MM-dd H:mm z", locale="en_GB") == "2025-03-04 3:53 GMT-10" |
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I did some digging and we get Hawaii-Aleutian Standard Time instead of GMT-10 here because of this fallback to the long tz name:
Lines 659 to 662 in 2b93a4a
When I get rid of it, get_timezone_gmt is used instead.
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Ah yeah, I should've mentioned I also found the culprit, but it's out of scope for this PR 😅
Fixes #1192 – in a way:
As far as I can tell, there's no well-specified operation called "get timezone name" in the TR35 spec, so doing what we do here (ending up using the location) is... okay for now, at least better than returning ∅∅∅.
However, this uncovers a bug in how we fallback timezone formatting in this specific case, for which I added an xfailing test.
There's also a new janky C++ tool that lets one format times in various TZes and locales and formats using ICU4C.