SOPA Redirect - Fixed dates to be in the proper format

sopa.php

<?php
add_action( 'init', 'make_sopa_blackout' );

function make_sopa_blackout() { 
	if ( ! is_admin()  ) { 
	        $current_time = current_time( 'timestamp' );
        	$start_time = strtotime( '2012/01/17 8:00' );
        	$end_time = strtotime( '2012/01/17 20:00' );
	        if( $current_time >= $start_time && $current_time <= $end_time )  {
	        	wp_redirect( 'http://oreilly.com/make-blackout.html', 503 );
	        	exit;
                }
        }
}