remove dtype from encoding for datetime64/timedelta64 variables to …

…prevent unnecessary casts
pydata · Sep 18, 2023 · f1d2bf7 · f1d2bf7
1 parent b08a9d8
commit f1d2bf7
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/xarray/coding/times.py b/xarray/coding/times.py
@@ -777,6 +777,11 @@ def encode(self, variable: Variable, name: T_Name = None) -> Variable:
             safe_setitem(attrs, "units", units, name=name)
             safe_setitem(attrs, "calendar", calendar, name=name)
 
+            # remove dtype from encoding to prevent unnecessary casts
+            # see GH #1064
+            if "dtype" in encoding:
+                encoding.pop("dtype")
+
             return Variable(dims, data, attrs, encoding, fastpath=True)
         else:
             return variable
@@ -810,6 +815,11 @@ def encode(self, variable: Variable, name: T_Name = None) -> Variable:
             data, units = encode_cf_timedelta(data, encoding.pop("units", None))
             safe_setitem(attrs, "units", units, name=name)
 
+            # remove dtype from encoding to prevent unnecessary casts
+            # see GH #1064
+            if "dtype" in encoding:
+                encoding.pop("dtype")
+
             return Variable(dims, data, attrs, encoding, fastpath=True)
         else:
             return variable