Add fallback when Intl not defined

h/static/scripts/test/time-test.js

@@ -99,6 +99,27 @@ describe('time', function () {
       it('creates correct fuzzy string for fixture ' + i,
         testFixture(f));
     }
+
+    it('falls back to simple strings for >24hrs ago', function () {
+      // If window.Intl is not available then the date formatting for dates
+      // more than one day ago falls back to a simple date string.
+      window.Intl = undefined;
+      var d = new Date();
+      sandbox.clock.tick(day * 2 * 1000);
+
+      assert.equal(time.toFuzzyString(d), 'Thu Jan 01 1970');
+    });
+
+    it('falls back to simple strings for >1yr ago', function () {
+      // If window.Intl is not available then the date formatting for dates
+      // more than one year ago falls back to a simple date string.
+      window.Intl = undefined;
+      var d = new Date();
+      sandbox.clock.tick(year * 2 * 1000);
+
+      assert.equal(time.toFuzzyString(d), 'Thu Jan 01 1970');
+    });
+
   });
 
   describe('.decayingInterval', function () {

h/static/scripts/time.js

@@ -56,14 +56,20 @@ var formatters = {};
  *
  */
 function format(date, options) {
-  var key = JSON.stringify(options);
-  var formatter = formatters[key];
+  if (typeof Intl !== 'undefined' && Intl.DateTimeFormat) {
+    var key = JSON.stringify(options);
+    var formatter = formatters[key];
 
-  if (!formatter) {
-    formatter = formatters[key] = new Intl.DateTimeFormat(undefined, options);
-  }
+    if (!formatter) {
+      formatter = formatters[key] = new Intl.DateTimeFormat(undefined,
+                                                            options);
+    }
 
-  return formatter.format(date);
+    return formatter.format(date);
+  } else {
+    // IE < 11, Safari <= 9.0.
+    return date.toDateString();
+  }
 }
 
 function dayAndMonth(date) {