--- a/dom/html/test/forms/test_input_date_key_events.html
+++ b/dom/html/test/forms/test_input_date_key_events.html
@@ -179,26 +179,26 @@ var testData = [
   },
   {
     // End key on day field sets it to the maximum day, which is 31.
     keys: ["VK_TAB", "VK_END"],
     initialVal: "2016-01-10",
     expectedVal: "2016-01-31"
   },
   {
-    // Home key on year field sets it to the minimum year, which is 0001.
+    // Home key should have no effect on year field.
     keys: ["VK_TAB", "VK_TAB", "VK_HOME"],
     initialVal: "2016-01-01",
-    expectedVal: "0001-01-01"
+    expectedVal: "2016-01-01"
   },
   {
-    // End key on year field sets it to the maximum year, which is 275760.
+    // End key should have no effect on year field.
     keys: ["VK_TAB", "VK_TAB", "VK_END"],
     initialVal: "2016-01-01",
-    expectedVal: "275760-01-01"
+    expectedVal: "2016-01-01"
   },
 ];
 
 function sendKeys(aKeys) {
   for (let i = 0; i < aKeys.length; i++) {
     let key = aKeys[i];
     if (key.startsWith("VK")) {
       synthesizeKey(key, {});

--- a/toolkit/content/widgets/datetimebox.xml
+++ b/toolkit/content/widgets/datetimebox.xml
@@ -323,16 +323,22 @@
         <![CDATA[
           if (this.isDisabled() || this.isReadonly()) {
             return;
           }
 
           let targetField = aEvent.originalTarget;
           let key = aEvent.key;
 
+          // Home/End key does nothing on year field.
+          if (targetField == this.mYearField && (key == "Home" ||
+                                                 key == "End")) {
+            return;
+          }
+
           switch (key) {
             case "ArrowUp":
               this.incrementFieldValue(targetField, 1);
               break;
             case "ArrowDown":
               this.incrementFieldValue(targetField, -1);
               break;
             case "PageUp": {