From b72da76b04c6dbf9bdb94a18bd91192e9c390321 Mon Sep 17 00:00:00 2001
From: Manuel Schlund <32543114+schlunma@users.noreply.github.com>
Date: Mon, 22 Jan 2024 17:11:03 +0100
Subject: [PATCH] Pin pandas to avoid broken `round` function (#2305)

Co-authored-by: Valeriu Predoi <valeriu.predoi@gmail.com>
---
 environment.yml                     | 2 +-
 esmvalcore/cmor/_fixes/icon/icon.py | 5 ++---
 setup.py                            | 2 +-
 3 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/environment.yml b/environment.yml
index 93582e968c..70923cf1a9 100644
--- a/environment.yml
+++ b/environment.yml
@@ -30,7 +30,7 @@ dependencies:
   - netcdf4
   - numpy !=1.24.3
   - packaging
-  - pandas
+  - pandas !=2.2.0  # github.com/ESMValGroup/ESMValCore/pull/2305
   - pillow
   - pip !=21.3
   - prov
diff --git a/esmvalcore/cmor/_fixes/icon/icon.py b/esmvalcore/cmor/_fixes/icon/icon.py
index 214cb6e99f..2e1dfd3bb3 100644
--- a/esmvalcore/cmor/_fixes/icon/icon.py
+++ b/esmvalcore/cmor/_fixes/icon/icon.py
@@ -492,9 +492,8 @@ def _fix_invalid_time_units(time_coord):
         # 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).
-        new_datetimes = (year_month_day + day_float).round(
-            'S'
-        ).dt.to_pydatetime()
+        rounded_datetimes = (year_month_day + day_float).round('s')
+        new_datetimes = np.array(rounded_datetimes.dt.to_pydatetime())
         new_dt_points = date2num(np.array(new_datetimes), new_t_units)
 
         # Modify time coordinate in place
diff --git a/setup.py b/setup.py
index f8c3e28550..10117035f6 100755
--- a/setup.py
+++ b/setup.py
@@ -47,7 +47,7 @@
         'netCDF4',
         'numpy!=1.24.3',
         'packaging',
-        'pandas',
+        'pandas!=2.2.0',  # github.com/ESMValGroup/ESMValCore/pull/2305
         'pillow',
         'prov',
         'psutil',