diff --git a/airtime_mvc/application/common/DateHelper.php b/airtime_mvc/application/common/DateHelper.php
index fc9d72b7d..823151c2f 100644
--- a/airtime_mvc/application/common/DateHelper.php
+++ b/airtime_mvc/application/common/DateHelper.php
@@ -112,71 +112,6 @@ class Application_Common_DateHelper
         return $now;
     }
 
-    /**
-     * Set the internal timestamp of the object.
-     */
-    function setDate($dateString)
-    {
-        $dateTime = new DateTime($dateString, new DateTimeZone("UTC"));
-        $this->_dateTime = $dateTime->getTimestamp();
-    }
-
-    /**
-     * Find the epoch timestamp difference from "now" to the beginning of today.
-     */
-    function getNowDayStartDiff()
-    {
-        $dayStartTs = ((int)($this->_dateTime/86400))*86400;
-        return $this->_dateTime - $dayStartTs;
-    }
-
-    /**
-     * Find the epoch timestamp difference from "now" to the end of today.
-     */
-    function getNowDayEndDiff()
-    {
-        $dayEndTs = ((int)(($this->_dateTime+86400)/86400))*86400;
-        return $dayEndTs - $this->_dateTime;
-    }
-
-    function getEpochTime()
-    {
-        return $this->_dateTime;
-    }
-
-    public static function TimeDiff($time1, $time2)
-    {
-        return strtotime($time2) - strtotime($time1);
-    }
-    
-    public static function TimeAdd($time1, $time2)
-    {
-        return strtotime($time2) + strtotime($time1);
-    }
-
-    public static function ConvertMSToHHMMSSmm($time)
-    {
-        $hours = floor($time / 3600000);
-        $time -= 3600000*$hours;
-
-        $minutes = floor($time / 60000);
-        $time -= 60000*$minutes;
-
-        $seconds = floor($time / 1000);
-        $time -= 1000*$seconds;
-
-        $ms = $time;
-
-        if (strlen($hours) == 1)
-        $hours = "0".$hours;
-        if (strlen($minutes) == 1)
-        $minutes = "0".$minutes;
-        if (strlen($seconds) == 1)
-        $seconds = "0".$seconds;
-
-        return $hours.":".$minutes.":".$seconds.".".$ms;
-    }
-
     /**
      * This function formats a time by removing seconds
      *
@@ -202,16 +137,6 @@ class Application_Common_DateHelper
             return $p_dateTime;
     }
 
-    public static function getDateFromTimestamp($p_dateTime){
-        $explode = explode(" ", $p_dateTime);
-        return $explode[0];
-    }
-
-    public static function getTimeFromTimestamp($p_dateTime){
-        $explode = explode(" ", $p_dateTime);
-        return $explode[1];
-    }
-
     /* Given a track length in the format HH:MM:SS.mm, we want to
      * convert this to seconds. This is useful for Liquidsoap which
      * likes input parameters give in seconds.
@@ -240,30 +165,6 @@ class Application_Common_DateHelper
         $totalSeconds = ($hours*3600 + $minutes*60 + $seconds).".$ms";
         return round($totalSeconds, 3);
     }
-
-    public static function ConvertToUtcDateTime($p_dateString, $timezone=null){
-        if (isset($timezone)) {
-            $dateTime = new DateTime($p_dateString, new DateTimeZone($timezone));
-        }
-        else {
-            $dateTime = new DateTime($p_dateString, new DateTimeZone(Application_Model_Preference::GetTimezone()));
-        }
-        $dateTime->setTimezone(new DateTimeZone("UTC"));
-
-        return $dateTime;
-    }
-    
-    /*
-     * Example input: "00:02:32.746562". Output is a DateInterval object
-     * representing that 2 minute, 32.746562 second interval.
-     *
-     */
-    public static function getDateIntervalFromString($p_interval){
-        list($hour_min_sec, $subsec) = explode(".", $p_interval);
-        list($hour, $min, $sec) = explode(":", $hour_min_sec);
-        
-        return new DateInterval("PT{$hour}H{$min}M{$sec}S");
-    }
     
     /**
      * returns true or false depending on input is wether in
diff --git a/airtime_mvc/application/models/Schedule.php b/airtime_mvc/application/models/Schedule.php
index 6271f9a4d..f5bddbad5 100644
--- a/airtime_mvc/application/models/Schedule.php
+++ b/airtime_mvc/application/models/Schedule.php
@@ -587,33 +587,6 @@ SQL;
         return $ret;
     }
 
-    /**
-     * Compute the difference between two times in the format          .
-     * "HH:MM:SS.mmmmmm" Note: currently only supports calculating     .
-     * millisec differences                                            .
-     *
-     * @param  string $p_time1
-     * @param  string $p_time2
-     * @return double
-     */
-    private static function TimeDiff($p_time1, $p_time2)
-    {
-        $parts1 = explode(".", $p_time1);
-        $parts2 = explode(".", $p_time2);
-        $diff = 0;
-        if ( (count($parts1) > 1) && (count($parts2) > 1) ) {
-            $millisec1 = substr($parts1[1], 0, 3);
-            $millisec1 = str_pad($millisec1, 3, "0");
-            $millisec1 = intval($millisec1);
-            $millisec2 = substr($parts2[1], 0, 3);
-            $millisec2 = str_pad($millisec2, 3, "0");
-            $millisec2 = intval($millisec2);
-            $diff = abs($millisec1 - $millisec2)/1000;
-        }
-
-        return $diff;
-    }
-
     /**
      * Returns an array of schedule items from cc_schedule table. Tries
      * to return at least 3 items (if they are available). The parameters
diff --git a/airtime_mvc/application/models/ShowBuilder.php b/airtime_mvc/application/models/ShowBuilder.php
index e742db3b8..2352bedb4 100644
--- a/airtime_mvc/application/models/ShowBuilder.php
+++ b/airtime_mvc/application/models/ShowBuilder.php
@@ -282,13 +282,13 @@ class Application_Model_ShowBuilder
             $row["starts"]   = $schedStartDT->format("H:i:s");
             $row["ends"]     = $schedEndDT->format("H:i:s");
             
-            $cue_out = Application_Common_DateHelper::calculateLengthInSeconds($p_item['cue_out']);
-            $cue_in = Application_Common_DateHelper::calculateLengthInSeconds($p_item['cue_in']);
+            $cue_out = Application_Common_DateHelper::playlistTimeToSeconds($p_item['cue_out']);
+            $cue_in = Application_Common_DateHelper::playlistTimeToSeconds($p_item['cue_in']);
             
             $run_time = $cue_out-$cue_in;
             
-            $formatter       = new LengthFormatter(Application_Common_DateHelper::ConvertMSToHHMMSSmm($run_time*1000));
-            $row['runtime']  = $formatter->format();
+            $formatter = new LengthFormatter(Application_Common_DateHelper::secondsToPlaylistTime($run_time));
+            $row['runtime'] = $formatter->format();
 
             $row["title"]    = htmlspecialchars($p_item["file_track_title"]);
             $row["creator"]  = htmlspecialchars($p_item["file_artist_name"]);
diff --git a/airtime_mvc/application/services/ShowService.php b/airtime_mvc/application/services/ShowService.php
index cd4b43225..54ccd2ba6 100644
--- a/airtime_mvc/application/services/ShowService.php
+++ b/airtime_mvc/application/services/ShowService.php
@@ -998,8 +998,13 @@ SQL;
         $datePeriod = $this->getDatePeriod($start, $timezone, $last_show,
             $repeatInterval, $populateUntil);
 
-        $utcLastShowDateTime = $last_show ?
-            Application_Common_DateHelper::ConvertToUtcDateTime($last_show, $timezone) : null;
+        if ($last_show) {
+        	$utcLastShowDateTime = new DateTime($last_show, new DateTimeZone($timezone));
+        	$utcLastShowDateTime->setTimezone(new DateTimeZone("UTC"));
+        }
+        else {
+        	$utcLastShowDateTime = null;
+        }
 
         $previousDate = clone $start;
 
@@ -1093,8 +1098,13 @@ SQL;
 
         $this->repeatType = $showDay->getDbRepeatType();
 
-        $utcLastShowDateTime = $last_show ?
-            Application_Common_DateHelper::ConvertToUtcDateTime($last_show, $timezone) : null;
+    	if ($last_show) {
+        	$utcLastShowDateTime = new DateTime($last_show, new DateTimeZone($timezone));
+        	$utcLastShowDateTime->setTimezone(new DateTimeZone("UTC"));
+        }
+        else {
+        	$utcLastShowDateTime = null;
+        }
 
         while ($start->getTimestamp() < $end->getTimestamp()) {
             list($utcStartDateTime, $utcEndDateTime) = $this->createUTCStartEndDateTime(