ENH: Add type check for DatetimeIndex in _to_datetime_with_unit

kosiew · kosiew · commit 14562cefc7d1 · 2025-01-31T18:39:35.000+08:00
diff --git a/pandas/core/tools/datetimes.py b/pandas/core/tools/datetimes.py
@@ -566,6 +566,8 @@ def _to_datetime_with_unit(arg, unit, name, utc: bool, errors: str) -> Index:
             )
 
     result = DatetimeIndex(arr, name=name)
+    if not isinstance(result, DatetimeIndex):
+        return result
 
     # GH#23758: We may still need to localize the result with tz
     # GH#25546: Apply tz_parsed first (from arg), then tz (from caller)

Original file line number	Diff line number	Diff line change
`@@ -566,6 +566,8 @@ def _to_datetime_with_unit(arg, unit, name, utc: bool, errors: str) -> Index:`
`566`	`566`	`)`
`567`	`567`
`568`	`568`	`result = DatetimeIndex(arr, name=name)`
	`569`	`+ if not isinstance(result, DatetimeIndex):`
	`570`	`+ return result`
`569`	`571`
`570`	`572`	`# GH#23758: We may still need to localize the result with tz`
`571`	`573`	`# GH#25546: Apply tz_parsed first (from arg), then tz (from caller)`