BUG: DatetimeIndex.diff raising TypeError

pandas-dev · Oct 30, 2023 · 0b040a1 · 0b040a1
1 parent 192a4e3
commit 0b040a1
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/pandas/core/indexes/base.py b/pandas/core/indexes/base.py
@@ -7017,7 +7017,11 @@ def diff(self, periods: int = 1) -> Self:
         Index([nan, 10.0, 10.0, 10.0, 10.0], dtype='float64')
 
         """
-        return self._constructor(self.to_series().diff(periods))
+        diff = self.to_series().diff(periods)
+        if diff.dtype != self.dtype:
+            # e.g. DTI.diff -> TDI
+            return Index(diff)
+        return self._constructor(diff)
 
     @final
     def round(self, decimals: int = 0) -> Self: