fix: tweak timestamp format

Author: ryon

html-templates/subtemplates/timestamp.tpl

@@ -3,6 +3,6 @@
         {$time = tif(date('Hi', $timestamp) == '0000' ? false : true)}
     {/if}
     <time datetime="{date($.const.DATE_W3C, $timestamp)}" title="{$timestamp|date_format:"%c"}">
-        {$timestamp|date_format:tif($time, "%-d %b %Y&mdash;%I:%M %P", "%-d %b %Y")}
+        {$timestamp|date_format:tif($time, "%-d %b %Y, %l:%M %P", "%-d %b %Y")}
     </time>
-{/strip}{/template}
+{/strip}{/template}