Made the application work when PHP's intl is not available

app/Resources/views/base.html.twig

@@ -148,6 +148,9 @@
             <script src="{{ asset('js/app.js') }}"></script>
         {% endblock %}
 
-        <!-- Page rendered on {{ 'now'|localizeddate('long', 'long') }} -->
+        {# it's not mandatory to set the timezone in localizeddate(). This is done to
+           avoid errors when the 'intl' PHP extension is not available and the application
+           is forced to use the limited "intl polyfill", which only supports UTC and GMT #}
+        <!-- Page rendered on {{ 'now'|localizeddate('long', 'long', null, 'UTC') }} -->
     </body>
 </html>

app/Resources/views/blog/about.html.twig

@@ -8,4 +8,8 @@
         </p>
     </div>
 </div>
-<!-- Fragment rendered on {{ 'now'|localizeddate('long', 'long') }} -->
+
+{# it's not mandatory to set the timezone in localizeddate(). This is done to
+   avoid errors when the 'intl' PHP extension is not available and the application
+   is forced to use the limited "intl polyfill", which only supports UTC and GMT #}
+<!-- Fragment rendered on {{ 'now'|localizeddate('long', 'long', null, 'UTC') }} -->

composer.json

@@ -23,6 +23,7 @@
         "sensio/framework-extra-bundle"        : "~3.0",
         "symfony/assetic-bundle"               : "~2.6",
         "symfony/monolog-bundle"               : "~2.7",
+        "symfony/polyfill-intl-icu"            : "^1.2",
         "symfony/swiftmailer-bundle"           : "~2.3",
         "symfony/symfony"                      : "~2.8",
         "twig/extensions"                      : "~1.2",