<?php
/**
 * Copyright 2009, 2010 AEGEE-Europe
 *
 * This file is part of AEGEE-Europe Online Membership System.
 *
 * AEGEE-Europe Online Membership System 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.
 *
 * AEGEE-Europe Online Membership System 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 AEGEE-Europe Online Membership System.  If not, see
 * <http://www.gnu.org/licenses/>.
 */

/**
 * Helper class for date processing
 */
abstract class DateHelper {
	/**
	 * Validate an SQL-style date
	 *
	 * @param string date in SQL-style (yyyy-mm-dd)
	 * @return boolean true in case date is valid, false otherwise
	 */
	public static function isSqlDate($date) {
		if( !preg_match("/(^(\d){4}\-(\d){2}\-(\d){2}$)/", $date) ) {
			return false;
		}
		return checkdate(substr($date, 5, 2), substr($date, 8, 2), substr($date, 0, 4));
	}

	public static function getDisplayDate($date) {
		// convert from 2002-02-01 to 01.02.2002
		if( $date == "0000-00-00 00:00:00" OR $date == "0000-00-00" ) {
			return "";
		}elseif( strlen($date)==10 ) {
			return date("d.m.Y", strtotime($date));
		}elseif( strlen($date)==16 ) {
			return date("d.m.Y H:i", strtotime($date));
		}elseif( strlen($date)==19 ) {
			return date("d.m.Y H:i:s", strtotime($date));
		}else {
			return $date;
		}
	}

	public static function getSqlDate($date) {
		// convert from 01.02.2002 to 2002-02-01
		$Y = substr($date, 6, 4);
		$m = substr($date, 3, 2);
		$d = substr($date, 0, 2);
		return "$Y-$m-$d";
	}
	
	/**
	 * Return all months in a year
	 *
	 * @return array of months
	 */
	public static function getMonths() {
		$ret = array();
		$ret['01'] = _("January");
		$ret['02'] = _("February");
		$ret['03'] = _("March");
		$ret['04'] = _("April");
		$ret['05'] = _("May");
		$ret['06'] = _("June");
		$ret['07'] = _("July");
		$ret['08'] = _("August");
		$ret['09'] = _("September");
		$ret['10'] = _("October");
		$ret['11'] = _("November");
		$ret['12'] = _("December");
		return $ret;
	}
}
?>