<?php
 class event_handler_argument_date extends views_handler_argument_date {
  
  function construct() {
    parent::construct();
    $this->arg_format = 'Y';
    //$this->formula = views_date_sql_extract('YEAR', "***table***.$this->real_field");

	//EXTRACT(YEAR FROM event.event_start)
    $this->formula = "EXTRACT(YEAR FROM ***table***.$this->real_field)";
  }
}


/*
SELECT node.nid AS nid
 FROM node node 
 LEFT JOIN event event ON node.nid = event.nid
 WHERE (node.type in ('event')) AND (EXTRACT (YEAR FROM event.event_start) = '2010')


*/