<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.

 * @license		http://codeigniter.com/user_guide/license.html

 * @link		http://codeigniter.com

 * @since		Version 1.0

 * @filesource

 */



// ------------------------------------------------------------------------



/**

 * CodeIgniter Date Helpers

 *

 * @package		CodeIgniter

 * @subpackage	Helpers

 * @category	Helpers

 * @author		ExpressionEngine Dev Team

 * @link		http://codeigniter.com/user_guide/helpers/date_helper.html

 */



// ------------------------------------------------------------------------



/**

 * Get "now" time

 *

 * Returns time() or its GMT equivalent based on the config file preference

 *

 * @access	public

 * @return	integer

 */

if ( ! function_exists('now'))

{

	function now()

	{

		$CI =& get_instance();



		if (strtolower($CI->config->item('time_reference')) == 'gmt')

		{

			$now = time();

			$system_time = mktime(gmdate("H", $now), gmdate("i", $now), gmdate("s", $now), gmdate("m", $now), gmdate("d", $now), gmdate("Y", $now));



			if (strlen($system_time) < 10)

			{

				$system_time = time();

				log_message('error', 'The Date class could not set a proper GMT timestamp so the local time() value was used.');

			}



			return $system_time;

		}

		else

		{

			return time();

		}

	}

}



// ------------------------------------------------------------------------



/**

 * Convert MySQL Style Datecodes

 *

 * This function is identical to PHPs date() function,

 * except that it allows date codes to be formatted using

 * the MySQL style, where each code letter is preceded

 * with a percent sign:  %Y %m %d etc...

 *

 * The benefit of doing dates this way is that you don't

 * have to worry about escaping your text letters that

 * match the date codes.

 *

 * @access	public

 * @param	string

 * @param	integer

 * @return	integer

 */

if ( ! function_exists('mdate'))

{

	function mdate($datestr = '', $time = '')

	{

		if ($datestr == '')

			return '';



		if ($time == '')

			$time = now();



		$datestr = str_replace('%\\', '', preg_replace("/([a-z]+?){1}/i", "\\\\\\1", $datestr));

		return date($datestr, $time);

	}

}



// ------------------------------------------------------------------------



/**

 * Standard Date

 *

 * Returns a date formatted according to the submitted standard.

 *

 * @access	public

 * @param	string	the chosen format

 * @param	integer	Unix timestamp

 * @return	string

 */

if ( ! function_exists('standard_date'))

{

	function standard_date($fmt = 'DATE_RFC822', $time = '')

	{

		$formats = array(

						'DATE_ATOM'		=>	'%Y-%m-%dT%H:%i:%s%Q',

						'DATE_COOKIE'	=>	'%l, %d-%M-%y %H:%i:%s UTC',

						'DATE_ISO8601'	=>	'%Y-%m-%dT%H:%i:%s%Q',

						'DATE_RFC822'	=>	'%D, %d %M %y %H:%i:%s %O',

						'DATE_RFC850'	=>	'%l, %d-%M-%y %H:%i:%s UTC',

						'DATE_RFC1036'	=>	'%D, %d %M %y %H:%i:%s %O',

						'DATE_RFC1123'	=>	'%D, %d %M %Y %H:%i:%s %O',

						'DATE_RSS'		=>	'%D, %d %M %Y %H:%i:%s %O',

						'DATE_W3C'		=>	'%Y-%m-%dT%H:%i:%s%Q'

						);



		if ( ! isset($formats[$fmt]))

		{

			return FALSE;

		}



		return mdate($formats[$fmt], $time);

	}

}



// ------------------------------------------------------------------------



/**

 * Timespan

 *

 * Returns a span of seconds in this format:

 *	10 days 14 hours 36 minutes 47 seconds

 *

 * @access	public

 * @param	integer	a number of seconds

 * @param	integer	Unix timestamp

 * @return	integer

 */

if ( ! function_exists('timespan'))

{

	function timespan($seconds = 1, $time = '')

	{

		$CI =& get_instance();

		$CI->lang->load('date');



		if ( ! is_numeric($seconds))

		{

			$seconds = 1;

		}



		if ( ! is_numeric($time))

		{

			$time = time();

		}



		if ($time <= $seconds)

		{

			$seconds = 1;

		}

		else

		{

			$seconds = $time - $seconds;

		}



		$str = '';

		$years = floor($seconds / 31536000);



		if ($years > 0)

		{

			$str .= $years.' '.$CI->lang->line((($years	> 1) ? 'date_years' : 'date_year')).', ';

		}



		$seconds -= $years * 31536000;

		$months = floor($seconds / 2628000);



		if ($years > 0 OR $months > 0)

		{

			if ($months > 0)

			{

				$str .= $months.' '.$CI->lang->line((($months	> 1) ? 'date_months' : 'date_month')).', ';

			}



			$seconds -= $months * 2628000;

		}



		$weeks = floor($seconds / 604800);



		if ($years > 0 OR $months > 0 OR $weeks > 0)

		{

			if ($weeks > 0)

			{

				$str .= $weeks.' '.$CI->lang->line((($weeks	> 1) ? 'date_weeks' : 'date_week')).', ';

			}



			$seconds -= $weeks * 604800;

		}



		$days = floor($seconds / 86400);



		if ($months > 0 OR $weeks > 0 OR $days > 0)

		{

			if ($days > 0)

			{

				$str .= $days.' '.$CI->lang->line((($days	> 1) ? 'date_days' : 'date_day')).', ';

			}



			$seconds -= $days * 86400;

		}



		$hours = floor($seconds / 3600);



		if ($days > 0 OR $hours > 0)

		{

			if ($hours > 0)

			{

				$str .= $hours.' '.$CI->lang->line((($hours	> 1) ? 'date_hours' : 'date_hour')).', ';

			}



			$seconds -= $hours * 3600;

		}



		$minutes = floor($seconds / 60);



		if ($days > 0 OR $hours > 0 OR $minutes > 0)

		{

			if ($minutes > 0)

			{

				$str .= $minutes.' '.$CI->lang->line((($minutes	> 1) ? 'date_minutes' : 'date_minute')).', ';

			}



			$seconds -= $minutes * 60;

		}



		if ($str == '')

		{

			$str .= $seconds.' '.$CI->lang->line((($seconds	> 1) ? 'date_seconds' : 'date_second')).', ';

		}



		return substr(trim($str), 0, -1);

	}

}



// ------------------------------------------------------------------------



/**

 * Number of days in a month

 *

 * Takes a month/year as input and returns the number of days

 * for the given month/year. Takes leap years into consideration.

 *

 * @access	public

 * @param	integer a numeric month

 * @param	integer	a numeric year

 * @return	integer

 */

if ( ! function_exists('days_in_month'))

{

	function days_in_month($month = 0, $year = '')

	{

		if ($month < 1 OR $month > 12)

		{

			return 0;

		}



		if ( ! is_numeric($year) OR strlen($year) != 4)

		{

			$year = date('Y');

		}



		if ($month == 2)

		{

			if ($year % 400 == 0 OR ($year % 4 == 0 AND $year % 100 != 0))

			{

				return 29;

			}

		}



		$days_in_month	= array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

		return $days_in_month[$month - 1];

	}

}



// ------------------------------------------------------------------------



/**

 * Converts a local Unix timestamp to GMT

 *

 * @access	public

 * @param	integer Unix timestamp

 * @return	integer

 */

if ( ! function_exists('local_to_gmt'))

{

	function local_to_gmt($time = '')

	{

		if ($time == '')

			$time = time();



		return mktime( gmdate("H", $time), gmdate("i", $time), gmdate("s", $time), gmdate("m", $time), gmdate("d", $time), gmdate("Y", $time));

	}

}



// ------------------------------------------------------------------------



/**

 * Converts GMT time to a localized value

 *

 * Takes a Unix timestamp (in GMT) as input, and returns

 * at the local value based on the timezone and DST setting

 * submitted

 *

 * @access	public

 * @param	integer Unix timestamp

 * @param	string	timezone

 * @param	bool	whether DST is active

 * @return	integer

 */

if ( ! function_exists('gmt_to_local'))

{

	function gmt_to_local($time = '', $timezone = 'UTC', $dst = FALSE)

	{

		if ($time == '')

		{

			return now();

		}



		$time += timezones($timezone) * 3600;



		if ($dst == TRUE)

		{

			$time += 3600;

		}



		return $time;

	}

}



// ------------------------------------------------------------------------



/**

 * Converts a MySQL Timestamp to Unix

 *

 * @access	public

 * @param	integer Unix timestamp

 * @return	integer

 */

if ( ! function_exists('mysql_to_unix'))

{

	function mysql_to_unix($time = '')

	{

		// We'll remove certain characters for backward compatibility

		// since the formatting changed with MySQL 4.1

		// YYYY-MM-DD HH:MM:SS



		$time = str_replace('-', '', $time);

		$time = str_replace(':', '', $time);

		$time = str_replace(' ', '', $time);



		// YYYYMMDDHHMMSS

		return  mktime(

						substr($time, 8, 2),

						substr($time, 10, 2),

						substr($time, 12, 2),

						substr($time, 4, 2),

						substr($time, 6, 2),

						substr($time, 0, 4)

						);

	}

}



// ------------------------------------------------------------------------



/**

 * Unix to "Human"

 *

 * Formats Unix timestamp to the following prototype: 2006-08-21 11:35 PM

 *

 * @access	public

 * @param	integer Unix timestamp

 * @param	bool	whether to show seconds

 * @param	string	format: us or euro

 * @return	string

 */

if ( ! function_exists('unix_to_human'))

{

	function unix_to_human($time = '', $seconds = FALSE, $fmt = 'us')

	{

		$r  = date('Y', $time).'-'.date('m', $time).'-'.date('d', $time).' ';



		if ($fmt == 'us')

		{

			$r .= date('h', $time).':'.date('i', $time);

		}

		else

		{

			$r .= date('H', $time).':'.date('i', $time);

		}



		if ($seconds)

		{

			$r .= ':'.date('s', $time);

		}



		if ($fmt == 'us')

		{

			$r .= ' '.date('A', $time);

		}



		return $r;

	}

}



// ------------------------------------------------------------------------



/**

 * Convert "human" date to GMT

 *

 * Reverses the above process

 *

 * @access	public

 * @param	string	format: us or euro

 * @return	integer

 */

if ( ! function_exists('human_to_unix'))

{

	function human_to_unix($datestr = '')

	{

		if ($datestr == '')

		{

			return FALSE;

		}



		$datestr = trim($datestr);

		$datestr = preg_replace("/\040+/", ' ', $datestr);



		if ( ! preg_match('/^[0-9]{2,4}\-[0-9]{1,2}\-[0-9]{1,2}\s[0-9]{1,2}:[0-9]{1,2}(?::[0-9]{1,2})?(?:\s[AP]M)?$/i', $datestr))

		{

			return FALSE;

		}



		$split = explode(' ', $datestr);



		$ex = explode("-", $split['0']);



		$year  = (strlen($ex['0']) == 2) ? '20'.$ex['0'] : $ex['0'];

		$month = (strlen($ex['1']) == 1) ? '0'.$ex['1']  : $ex['1'];

		$day   = (strlen($ex['2']) == 1) ? '0'.$ex['2']  : $ex['2'];



		$ex = explode(":", $split['1']);



		$hour = (strlen($ex['0']) == 1) ? '0'.$ex['0'] : $ex['0'];

		$min  = (strlen($ex['1']) == 1) ? '0'.$ex['1'] : $ex['1'];



		if (isset($ex['2']) && preg_match('/[0-9]{1,2}/', $ex['2']))

		{

			$sec  = (strlen($ex['2']) == 1) ? '0'.$ex['2'] : $ex['2'];

		}

		else

		{

			// Unless specified, seconds get set to zero.

			$sec = '00';

		}



		if (isset($split['2']))

		{

			$ampm = strtolower($split['2']);



			if (substr($ampm, 0, 1) == 'p' AND $hour < 12)

				$hour = $hour + 12;



			if (substr($ampm, 0, 1) == 'a' AND $hour == 12)

				$hour =  '00';



			if (strlen($hour) == 1)

				$hour = '0'.$hour;

		}



		return mktime($hour, $min, $sec, $month, $day, $year);

	}

}



// ------------------------------------------------------------------------



/**

 * Timezone Menu

 *

 * Generates a drop-down menu of timezones.

 *

 * @access	public

 * @param	string	timezone

 * @param	string	classname

 * @param	string	menu name

 * @return	string

 */

if ( ! function_exists('timezone_menu'))

{

	function timezone_menu($default = 'UTC', $class = "", $name = 'timezones')

	{

		$CI =& get_instance();

		$CI->lang->load('date');



		if ($default == 'GMT')

			$default = 'UTC';



		$menu = '<select name="'.$name.'"';



		if ($class != '')

		{

			$menu .= ' class="'.$class.'"';

		}



		$menu .= ">\n";



		foreach (timezones() as $key => $val)

		{

			$selected = ($default == $key) ? " selected='selected'" : '';

			$menu .= "<option value='{$key}'{$selected}>".$CI->lang->line($key)."</option>\n";

		}



		$menu .= "</select>";



		return $menu;

	}

}



// ------------------------------------------------------------------------



/**

 * Timezones

 *

 * Returns an array of timezones.  This is a helper function

 * for various other ones in this library

 *

 * @access	public

 * @param	string	timezone

 * @return	string

 */

if ( ! function_exists('timezones'))

{

	function timezones($tz = '')

	{

		// Note: Don't change the order of these even though

		// some items appear to be in the wrong order



		$zones = array(

						'UM12'		=> -12,

						'UM11'		=> -11,

						'UM10'		=> -10,

						'UM95'		=> -9.5,

						'UM9'		=> -9,

						'UM8'		=> -8,

						'UM7'		=> -7,

						'UM6'		=> -6,

						'UM5'		=> -5,

						'UM45'		=> -4.5,

						'UM4'		=> -4,

						'UM35'		=> -3.5,

						'UM3'		=> -3,

						'UM2'		=> -2,

						'UM1'		=> -1,

						'UTC'		=> 0,

						'UP1'		=> +1,

						'UP2'		=> +2,

						'UP3'		=> +3,

						'UP35'		=> +3.5,

						'UP4'		=> +4,

						'UP45'		=> +4.5,

						'UP5'		=> +5,

						'UP55'		=> +5.5,

						'UP575'		=> +5.75,

						'UP6'		=> +6,

						'UP65'		=> +6.5,

						'UP7'		=> +7,

						'UP8'		=> +8,

						'UP875'		=> +8.75,

						'UP9'		=> +9,

						'UP95'		=> +9.5,

						'UP10'		=> +10,

						'UP105'		=> +10.5,

						'UP11'		=> +11,

						'UP115'		=> +11.5,

						'UP12'		=> +12,

						'UP1275'	=> +12.75,

						'UP13'		=> +13,

						'UP14'		=> +14

					);



		if ($tz == '')

		{

			return $zones;

		}



		if ($tz == 'GMT')

			$tz = 'UTC';



		return ( ! isset($zones[$tz])) ? 0 : $zones[$tz];

	}

}





/* End of file date_helper.php */

/* Location: ./system/helpers/date_helper.php */