From e619a4c96446f5dad39702bec4702abdf93cd230 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kai=20M=C3=BChlbauer?= <kai.muehlbauer@uni-bonn.de>
Date: Thu, 9 Jan 2025 11:54:58 +0100
Subject: [PATCH] fix cftime_to_nptime in cftimeindex

---
 xarray/coding/cftimeindex.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xarray/coding/cftimeindex.py b/xarray/coding/cftimeindex.py
index 5eb5f6dce12..bd5f51551c7 100644
--- a/xarray/coding/cftimeindex.py
+++ b/xarray/coding/cftimeindex.py
@@ -588,7 +588,7 @@ def to_datetimeindex(self, unsafe=False):
             return pd.DatetimeIndex([])
 
         # transform to us-resolution is needed for DatetimeIndex
-        nptimes = cftime_to_nptime(self).astype("=M8[us]")
+        nptimes = cftime_to_nptime(self, time_unit="us")
         calendar = infer_calendar_name(self)
         if calendar not in _STANDARD_CALENDARS and not unsafe:
             warnings.warn(