From fcc182bcab25ecbaefdecbd0eca8dc73579cd39f Mon Sep 17 00:00:00 2001
From: MarcoGorelli <>
Date: Wed, 2 Nov 2022 14:01:24 +0000
Subject: [PATCH 1/2] maybe fix arm test

---
 pandas/core/arrays/datetimes.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/core/arrays/datetimes.py b/pandas/core/arrays/datetimes.py
index d2c2811759e7c..1ec3814c88f8d 100644
--- a/pandas/core/arrays/datetimes.py
+++ b/pandas/core/arrays/datetimes.py
@@ -2232,7 +2232,7 @@ def maybe_convert_dtype(data, copy: bool, tz: tzinfo | None = None):
     if is_float_dtype(data.dtype):
         # pre-2.0 we treated these as wall-times, inconsistent with ints
         # GH#23675, GH#45573 deprecated to treat symmetrically with integer dtypes
-        data = data.astype(np.int64)
+        data = data.astype("M8[ns]").view("i8")
         copy = False
 
     elif is_timedelta64_dtype(data.dtype) or is_bool_dtype(data.dtype):

From 95aeb5242e36fc67f3a5dfed28d91819ce6883b8 Mon Sep 17 00:00:00 2001
From: MarcoGorelli <>
Date: Wed, 2 Nov 2022 15:09:31 +0000
Subject: [PATCH 2/2] add comment linking to issue

---
 pandas/core/arrays/datetimes.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pandas/core/arrays/datetimes.py b/pandas/core/arrays/datetimes.py
index 1ec3814c88f8d..1265bb469d7eb 100644
--- a/pandas/core/arrays/datetimes.py
+++ b/pandas/core/arrays/datetimes.py
@@ -2231,7 +2231,9 @@ def maybe_convert_dtype(data, copy: bool, tz: tzinfo | None = None):
 
     if is_float_dtype(data.dtype):
         # pre-2.0 we treated these as wall-times, inconsistent with ints
-        # GH#23675, GH#45573 deprecated to treat symmetrically with integer dtypes
+        # GH#23675, GH#45573 deprecated to treat symmetrically with integer dtypes.
+        # Note: data.astype(np.int64) fails ARM tests, see
+        # https://github.com/pandas-dev/pandas/issues/49468.
         data = data.astype("M8[ns]").view("i8")
         copy = False