From 6548b418bfbd2b59ef3dc699148244b9f373572a Mon Sep 17 00:00:00 2001
From: "Nina.Hakansson" <6160529+ninahakansson@users.noreply.github.com>
Date: Fri, 29 May 2026 09:28:02 +0200
Subject: [PATCH 1/2] Fix datatype of default time encoding

---
 satpy/cf/encoding.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/satpy/cf/encoding.py b/satpy/cf/encoding.py
index 5c77b6d69f..9dd9338855 100644
--- a/satpy/cf/encoding.py
+++ b/satpy/cf/encoding.py
@@ -71,6 +71,7 @@ def _set_default_time_encoding(encoding, dataset):
         time_enc = {"units": default.attrs["units"], "calendar": default.attrs["calendar"]}
         time_enc.update(encoding.get("time", {}))
         bounds_enc = {"units": time_enc["units"],
+                      "dtype": "float64",
                       "calendar": time_enc["calendar"],
                       "_FillValue": None}
         encoding["time"] = time_enc

From 88351be94b27dd38b8dfaee5414bac8f0b694e5a Mon Sep 17 00:00:00 2001
From: "Nina.Hakansson" <6160529+ninahakansson@users.noreply.github.com>
Date: Fri, 29 May 2026 10:14:23 +0200
Subject: [PATCH 2/2] Fix also time_enc and tests

---
 satpy/cf/encoding.py                  | 4 +++-
 satpy/tests/cf_tests/test_encoding.py | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/satpy/cf/encoding.py b/satpy/cf/encoding.py
index 9dd9338855..eaf04ba48e 100644
--- a/satpy/cf/encoding.py
+++ b/satpy/cf/encoding.py
@@ -68,7 +68,9 @@ def _set_default_time_encoding(encoding, dataset):
             dtnp64 = dataset["time"].data
 
         default = CFDatetimeCoder().encode(xr.DataArray(dtnp64))
-        time_enc = {"units": default.attrs["units"], "calendar": default.attrs["calendar"]}
+        time_enc = {"units": default.attrs["units"],
+                    "dtype": "float64",
+                    "calendar": default.attrs["calendar"]}
         time_enc.update(encoding.get("time", {}))
         bounds_enc = {"units": time_enc["units"],
                       "dtype": "float64",
diff --git a/satpy/tests/cf_tests/test_encoding.py b/satpy/tests/cf_tests/test_encoding.py
index 103736120d..3fecbefc59 100644
--- a/satpy/tests/cf_tests/test_encoding.py
+++ b/satpy/tests/cf_tests/test_encoding.py
@@ -113,8 +113,10 @@ def test_with_time(self, fake_ds):
             "bar": {"chunksizes": (1, 1, 1)},
             "time": {"_FillValue": None,
                      "calendar": "proleptic_gregorian",
+                     "dtype": "float64",
                      "units": "days since 2009-07-01 12:15:00"},
             "time_bnds": {"_FillValue": None,
+                          "dtype": "float64",
                           "calendar": "proleptic_gregorian",
                           "units": "days since 2009-07-01 12:15:00"}
         }