« MODx Parse Error »

MODx encountered the following error while attempting to parse the requested resource:
« PHP Parse Error »
 
PHP error debug
  Error: date() [function.date]: It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EDT/-4.0/DST' instead 
  Error type/ Nr.: Warning - 2 
  File: /home/bogotaco/public_html/assets/snippets/maxigallery/maxigallery.php 
  Line: 73 
  Line 73 source: $mgconfig['thumb_watermark_txt'] = (isset($thumb_watermark_txt)) ? $thumb_watermark_txt : "Copyright ".date("Y"); // [ text ]  
 
Parser timing
  MySQL: 0.0399 s(11 Requests)
  PHP: 0.0867 s 
  Total: 0.1267 s