Fix rounding of Pandas datetimes in ICON CMORizer

environment.yml

@@ -29,7 +29,7 @@ dependencies:
   - netcdf4
   - numpy !=1.24.3,<2.0.0  # avoid pulling 2.0.0rcX
   - packaging
-  - pandas !=2.2.0,!=2.2.1,!=2.2.2  # github.com/ESMValGroup/ESMValCore/pull/2305 and #2349
+  - pandas
   - pillow
   - pip !=21.3
   - prov

esmvalcore/cmor/_fixes/icon/icon.py

@@ -492,8 +492,11 @@ def _fix_invalid_time_units(time_coord):
         # Finally, add date and day fraction to get final datetime and convert
         # it to correct units. Note: we also round to next second, otherwise
         # this results in times that are off by 1s (e.g., 13:59:59 instead of
-        # 14:00:00).
-        rounded_datetimes = (year_month_day + day_float).round('s')
+        # 14:00:00). We round elements individually since rounding the
+        # pd.Series object directly is broken
+        # (https://github.com/pandas-dev/pandas/issues/57002).
+        datetimes = year_month_day + day_float
+        rounded_datetimes = pd.Series(dt.round('s') for dt in datetimes)
         with warnings.catch_warnings():
             # We already fixed the deprecated code as recommended in the
             # warning, but it still shows up -> ignore it

setup.py

@@ -47,7 +47,7 @@
         'netCDF4',
         'numpy!=1.24.3,<2.0.0',  # avoid pulling 2.0.0rc1
         'packaging',
-        'pandas!=2.2.0,!=2.2.1,!=2.2.2',  # GH #2305 #2349 etc
+        'pandas',
         'pillow',
         'prov',
         'psutil',