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FIX: robust DatetimeIndex.union across DST transitions #63088

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FIX: robust DatetimeIndex.union across DST transitions #63088

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@antznette1 antznette1 commented Nov 12, 2025 •
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  • Guard range-based setops for tz-aware DatetimeIndex to avoid RangeIndex assumptions that don’t hold across DST transitions in local time.
  • For tz-aware union, compute union in UTC, then tz-convert back and infer freq. This preserves tz and correct ordering without fabricating nonexistent local times across DST.
  • Flips new test to pass: test_union_across_dst_boundary.
  • Notes:
    • Uses freq="h" alias.
    • Aligns expected unit via .as_unit(left.unit).

Ref: #62915 and tests-only PR #63087.

@antznette1 antznette1 marked this pull request as ready for review November 12, 2025 09:16
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