diff --git a/lib/openhab/core/types/date_time_type.rb b/lib/openhab/core/types/date_time_type.rb
index 4c84459fa..d3b3874a4 100644
--- a/lib/openhab/core/types/date_time_type.rb
+++ b/lib/openhab/core/types/date_time_type.rb
@@ -193,6 +193,7 @@ def wday
         #
         # @return [String] The timezone in `[+-]hh:mm(:ss)` format (`Z` for UTC)
         #
+        # @deprecated This method has been deprecated in openHAB 4.3.
         def zone
           zoned_date_time.zone.id
         end
diff --git a/spec/openhab/core/types/date_time_type_spec.rb b/spec/openhab/core/types/date_time_type_spec.rb
index 3c03f176a..fc52475b4 100644
--- a/spec/openhab/core/types/date_time_type_spec.rb
+++ b/spec/openhab/core/types/date_time_type_spec.rb
@@ -26,7 +26,12 @@
     specify { expect(date2.wday).to be 0 }
     specify { expect(date2).to be_utc }
     specify { expect(date2.month).to be 1 }
-    specify { expect(date2.zone).to eql "Z" }
+
+    if OpenHAB::Core.version < OpenHAB::Core::V4_3
+      specify { expect(date2.zone).to eql "Z" }
+    else
+      specify { expect(date2.zone).to eql "Etc/UTC" }
+    end
   end
 
   it "considers same time but different zone to be equal" do
diff --git a/spec/openhab/core_ext/ephemeris_spec.rb b/spec/openhab/core_ext/ephemeris_spec.rb
index c5920e515..5e0137c5d 100644
--- a/spec/openhab/core_ext/ephemeris_spec.rb
+++ b/spec/openhab/core_ext/ephemeris_spec.rb
@@ -17,7 +17,7 @@
     end
 
     it "returns nil for a non-holiday" do
-      expect(LocalDate.parse("2022-12-26").holiday).to be_nil
+      expect(LocalDate.parse("2022-12-27").holiday).to be_nil
     end
   end