diff --git a/clock.js b/clock.js
index 8583194..b48e68c 100755
--- a/clock.js
+++ b/clock.js
@@ -18,7 +18,7 @@ Drupal.behaviors.clockDisplay = {
       {long: Drupal.t('February'), short: Drupal.t('Feb')},
       {long: Drupal.t('March'), short: Drupal.t('Mar')},
       {long: Drupal.t('April'), short: Drupal.t('Apr')},
-	  // Use context if http://drupal.org/node/488496 gets in.
+      // Use context if http://drupal.org/node/488496 gets in.
       {long: Drupal.t('May'), short: Drupal.t('May')},
       {long: Drupal.t('June'), short: Drupal.t('Jun')},
       {long: Drupal.t('July'), short: Drupal.t('Jul')},
@@ -49,11 +49,6 @@ Drupal.behaviors.clockDisplay = {
       // Initialize variables.
       // A PHP date format string.
       var dateFormat = settings['date_format'];
-      // Creates a JavaScript date object, from a specially formatted date string.
-      // Note that due to JavaScript's inferior time zone handling, time zone
-      // related date formatters will return the time zone of the Drupal site, not
-      // the visiting user if the time zone is set to 'Local'.
-      var date = (settings['local'] == 1) ? new Date() : new Date(settings['time']);
       // Prepare the timezone object.
       var timeZone = {
         // The name of the timezone, e.g. 'Europe/London'.
@@ -65,6 +60,19 @@ Drupal.behaviors.clockDisplay = {
         // The name of the offset, e.g. 'GMT'.
         offsetName: settings['offset_name'],
       };
+      // Creates a JavaScript date object, by calculating the difference between
+      // the target offset and the current offset and adding that to the current
+      // time.
+      // Note that due to JavaScript's inferior time zone handling, time zone
+      // related date formatters will return the time zone of the Drupal site, not
+      // the visiting user if the time zone is set to 'Local'.
+      var date = new Date();
+      // JavaScript returns the time zone offset reversely signed as PHP,
+      // therefore we calculate the difference in the absolute values by adding
+      // the two numbers.
+      if (!Drupal.settings['local']) {
+        date = new Date(date.getTime() + (timeZone.offsetSeconds/60 + date.getTimezoneOffset())*60000);
+      }
       
       clocks[cid] = {
         date: date,
@@ -73,24 +81,24 @@ Drupal.behaviors.clockDisplay = {
       }
     }
 
-    window.setInterval(function () {
-      for (var i = 0; i < allSettings['names'].length; i++) {
-        var cid = allSettings['names'][i];
-    	clock = clocks[cid];
-        $('span.' + cid).each(function () {
-          // Recalculate the date every second.
-
-          // Add 1 second (1000 milliseconds) to the time.
-          var timestamp = clock.date.getTime();
-          timestamp += 1000;
-          clock.date = new Date(timestamp);
-          // Format the clock.
-          formattedDate = formatDate(clock.date, clock.dateFormat, clock.timeZone, monthNames, weekdayNames);
-          $('span.' + cid).text(formattedDate);
-          clocks[cid] = clock;
+    for (var i = 0; i < allSettings['names'].length; i++) {
+      var cid = allSettings['names'][i];
+      clock = clocks[cid];
+      $('span.' + cid).each(function () {
+        $(this).once(cid, function() {
+          window.setInterval(function () {
+            // Add 1 second (1000 milliseconds) to the time.
+            var timestamp = clock.date.getTime();
+            timestamp += 1000;
+            clock.date = new Date(timestamp);
+            // Format the clock.
+            formattedDate = formatDate(clock.date, clock.dateFormat, clock.timeZone, monthNames, weekdayNames);
+            $('span.' + cid).text(formattedDate);
+            clocks[cid] = clock;
+          }, 1000);
         });
-      }
-    }, 1000);
+      });
+    }
 
   }
 };