Output times in UTC.

Let the client localize the times with js/local-time.js themselves. No
one cares what the server timezone is.

This fixes a bug where posts made in a different daylight savings mode
have their times displayed off by an hour. Their times would be rendered
to the server's own timezone area correctly, but then the server's
*current* utc-offset would be appended, which wouldn't match up.

inc/lib/Twig/Extensions/Extension/Tinyboard.php

@@ -57,8 +57,7 @@ class Twig_Extensions_Extension_Tinyboard extends Twig_Extension
 }
 
 function twig_timezone_function() {
-	// there's probably a much easier way of doing this
-	return sprintf("%s%02d", ($hr = (int)floor(($tz = date('Z')) / 3600)) > 0 ? '+' : '-', abs($hr)) . ':' . sprintf("%02d", (($tz / 3600) - $hr) * 60);
+	return 'Z';
 }
 
 function twig_split_filter($str, $delim) {
@@ -75,7 +74,7 @@ function twig_remove_whitespace_filter($data) {
 }
 
 function twig_date_filter($date, $format) {
-	return strftime($format, $date);
+	return gmstrftime($format, $date);
 }
 
 function twig_hasPermission_filter($mod, $permission, $board = null) {