diff --git a/index.php b/index.php
index 2ae270f..9293e7b 100644
--- a/index.php
+++ b/index.php
@@ -1,9 +1,9 @@
 <?php
+
 # config
 $ical = 'https://cloud.MYURL/remote.php/dav/public-calendars/CALENDARID/?export';
 $cachefile = 'cache/hackcal.ics';
 $cachetime = 120; // 2 min
-setlocale(LC_TIME, "de_DE.utf8");
 
 # requirements
 require_once 'ICal/ICal.php';
@@ -34,6 +34,10 @@ foreach ($events as $event) {
 		continue;
 	}
 
+	if (isset($event->categories) && strpos($event->categories, "hidden")) {
+		continue;
+	}
+
 	$start = new DateTime($event->dtstart);
 	$end = new DateTime($event->dtend);
 	$uid = $event->uid;
@@ -44,15 +48,18 @@ foreach ($events as $event) {
 	foreach ($period as $dt) {
 		$date = $dt->format("Y-m-d");
 
-		$result[$date]["name"] = strftime('%e. %B %Y', $dt->getTimestamp());
-		$result[$date]["weekday"] = strftime('%A', $dt->getTimestamp());
+		$dateFormatter = new IntlDateFormatter('de_DE', IntlDateFormatter::LONG, IntlDateFormatter::NONE, 'Europe/Berlin', IntlDateFormatter::GREGORIAN);
+		$weekdayFormatter = new IntlDateFormatter('de_DE', IntlDateFormatter::NONE, IntlDateFormatter::NONE, 'Europe/Berlin', IntlDateFormatter::GREGORIAN, 'EEEE');
+		
+		$result[$date]["name"] = $dateFormatter->format($dt->getTimestamp());
+		$result[$date]["weekday"] = $weekdayFormatter->format($dt->getTimestamp());
 		$result[$date]["events"][$uid]["dtstart"] = $event->dtstart; #TODO: Zeitzone aus lib auslesen
 		$result[$date]["events"][$uid]["dtend"] = $event->dtend; #TODO: Zeitzone aus lib auslesen
 		$result[$date]["events"][$uid]["datestr"] = (isset($event->dtstart_array[0]["VALUE"]) && $event->dtstart_array[0]["VALUE"] == 'DATE')?'Ganztägig':$start->format('H:i');
 		$result[$date]["events"][$uid]["summary"] = $event->summary;
 		$result[$date]["events"][$uid]["location"] = $event->location;
 		$result[$date]["events"][$uid]["description"] = $event->description;
-		$result[$date]["events"][$uid]["categories"] = $event->categories;
+		if(isset($event->categories)) $result[$date]["events"][$uid]["categories"] = $event->categories;
 	}
 
 }