diff -r 000000000000 -r 6474c204b198 browser/devtools/webconsole/test/browser_webconsole_bug_580454_timestamp_l10n.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/webconsole/test/browser_webconsole_bug_580454_timestamp_l10n.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+/* vim:set ts=2 sw=2 sts=2 et: */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ *
+ * Contributor(s):
+ *  Patrick Walton <pcwalton@mozilla.com>
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+// Tests that appropriately-localized timestamps are printed.
+
+const TEST_URI = "http://example.com/browser/browser/devtools/webconsole/test/test-console.html";
+
+function test() {
+  addTab(TEST_URI);
+  browser.addEventListener("DOMContentLoaded", testTimestamp, false);
+
+  function testTimestamp()
+  {
+    browser.removeEventListener("DOMContentLoaded", testTimestamp, false);
+    const TEST_TIMESTAMP = 12345678;
+    let date = new Date(TEST_TIMESTAMP);
+    let localizedString = WCU_l10n.timestampString(TEST_TIMESTAMP);
+    isnot(localizedString.indexOf(date.getHours()), -1, "the localized " +
+          "timestamp contains the hours");
+    isnot(localizedString.indexOf(date.getMinutes()), -1, "the localized " +
+          "timestamp contains the minutes");
+    isnot(localizedString.indexOf(date.getSeconds()), -1, "the localized " +
+          "timestamp contains the seconds");
+    isnot(localizedString.indexOf(date.getMilliseconds()), -1, "the localized " +
+          "timestamp contains the milliseconds");
+    finishTest();
+  }
+}
+