Index: trunk/src/org/openstreetmap/josm/gui/animation/AnimationExtensionManager.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/animation/AnimationExtensionManager.java	(revision 17725)
+++ trunk/src/org/openstreetmap/josm/gui/animation/AnimationExtensionManager.java	(revision 17726)
@@ -3,4 +3,5 @@
 
 import java.time.LocalDate;
+import java.time.ZoneId;
 
 import org.openstreetmap.josm.data.preferences.BooleanProperty;
@@ -43,5 +44,5 @@
 
     private static boolean isChristmas() {
-        return LocalDate.now().getDayOfYear() > 350;
+        return LocalDate.now(ZoneId.systemDefault()).getDayOfYear() > 350;
     }
 }