diff --git a/package.json b/package.json
index 53e5da6..88fb929 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "doomsday",
-    "version": "1.3.18",
+    "version": "1.3.19",
     "description": "Test your mastery of Conway's Doomsday rule.",
     "author": "Florine W. Dekker",
     "browser": "dist/bundle.js",
diff --git a/src/main/js/main.js b/src/main/js/main.js
index b87832b..f76f6cb 100644
--- a/src/main/js/main.js
+++ b/src/main/js/main.js
@@ -290,7 +290,7 @@ class DoomsdayDate {
      */
     static getWeekDayOf(date) {
         if (date instanceof Date) {
-            return date.toLocaleString("en-US", {timeZone: "GMT", weekday: "long"});
+            return date.toLocaleString("en-US", {weekday: "long"});
         } else {
             switch (date % 7) {
                 case 0: