Auto update copyright year

copyrightYear.php

<?php
/*
 * copyrightYear: get years to copyright footer
 * Parameters:
 * 	start [optional]: First year of website. 
 * 		DEFAULT: nothing.
 * 	separator [optional]: the space string between start and current year
 * [[copyrightYear]]				// return: 2016
 * [[copyrightYear? &start=`2014`]]	// return: 2014 – 2016
 */
  $start = $modx->getOption('start', $scriptProperties, date("Y"));
  $separator = $modx->getOption('separator', $scriptProperties, ' - ');
  $now = date("Y");
  $start = isset($start)? $start : $now;
  $years = ($now > $start && $start > '1970') ? $start . $separator . $now : $now;
return $years;