<?php
/*
 *      Copyright 2012 Douglas Robbins <hide@address.com>
 *      
 *      This file is part of Blite, a blogging application, available at
 *      <http://blite.ca/>.
 * 
 *      Blite is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 3 of the License, or
 *      (at your option) any later version.
 *      
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *      
 *      You should have received a copy of the GNU General Public License
 *      along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

session_start();

// Valid GMT offsets.
$valid = array ("-12", "-11", "-10", "-9.5", "-9", "-8", "-7", "-6", "-5", "-4.5", "-4", "-3.5", "-3", "-2.5", "-2", "-1", "0", "+1", "+2", "+3", "+3.5", "+4", "+4.5", "+5", "+5.5", "+5.75", "+6", "+6.5", "+7", "+8", "+8.75", "+9", "+9.5", "+10", "+10.5", "+11", "+11.5", "+12", "+12.75", "+13", "+14");

// Set a cookie for time offset from GMT

if ( $_SESSION['lastpage'] ) {
	if ( $_POST['offset'] && is_numeric($_POST['offset']) ) {
		$offset = $_POST['offset'];
		if ($offset > 0 && $offset{0} !== '+') {
			$offset = '+' . $offset;
		}
		if (!in_array($offset, $valid)) {
			$offset = 0;
		}
	}
	else {
		$offset = "0";
	}
	$expire = time() + 15552000;
	setcookie('timeoffset', $offset, $expire, '', '');
	header("Location: " . $_SESSION['lastpage'] . '#bottom');
}
else {
	header("Location: ./");
}
exit;