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<?php

/**

 * TDateTimeStamp class file.

 *

 * COPYRIGHT

 * (c) 2003-2005 John Lim and released under BSD-style license except for code by

 * jackbbs, which includes getTimeStamp, getGMTDiff, isLeapYear

 * and originally found at http://www.php.net/manual/en/function.mktime.php

 *

 * @author Wei Zhuo <weizhuo[at]gamil[dot]com>

 * @link http://www.pradosoft.com/

 * @copyright Copyright © 2005-2008 PradoSoft

 * @license http://www.pradosoft.com/license/

 * @version $Id: TDateTimeStamp.php 2488 2008-08-06 01:34:06Z knut $

 * @package System.Util

 */

/*

	This code was originally for windows. But apparently this problem happens

	also with Linux, RH 7.3 and later!

	glibc-2.2.5-34 and greater has been changed to return -1 for dates <

	1970.  This used to work.  The problem exists with RedHat 7.3 and 8.0

	echo (mktime(0, 0, 0, 1, 1, 1960));  // prints -1

	References:

	 http://bugs.php.net/bug.php?id=20048&edit=2

	 http://lists.debian.org/debian-glibc/2002/debian-glibc-200205/msg00010.html

*/

if (!defined('ADODB_ALLOW_NEGATIVE_TS')

	&& !defined('ADODB_NO_NEGATIVE_TS')) define('ADODB_NO_NEGATIVE_TS',1);

/**

 * TDateTimeStamp Class

 *

 * TDateTimeStamp Class is adpated from the ADOdb Date Library,

 * part of the ADOdb abstraction library

 * Download: http://phplens.com/phpeverywhere/

 *

 * http://phplens.com/phpeverywhere/adodb_date_library

 *

 * PHP native date functions use integer timestamps for computations.

 * Because of this, dates are restricted to the years 1901-2038 on Unix

 * and 1970-2038 on Windows due to integer overflow for dates beyond

 * those years. This library overcomes these limitations by replacing the

 * native function's signed integers (normally 32-bits) with PHP floating

 * point numbers (normally 64-bits).

 *

 * Dates from 100 A.D. to 3000 A.D. and later have been tested. The minimum

 * is 100 A.D. as <100 will invoke the 2 => 4 digit year conversion.

 * The maximum is billions of years in the future, but this is a theoretical

 * limit as the computation of that year would take too long with the

 * current implementation of {@link getTimeStamp}.

 *

 * PERFORMANCE

 * For high speed, this library uses the native date functions where

 * possible, and only switches to PHP code when the dates fall outside

 * the 32-bit signed integer range.

 *

 * @author Wei Zhuo <weizhuo[at]gmail[dot]com>

 * @version $Id: TDateTimeStamp.php 2488 2008-08-06 01:34:06Z knut $

 * @package System.Util

 * @since 3.0.4

 */

class TDateTimeStamp

{

	protected static $_month_normal = array("",31,28,31,30,31,30,31,31,30,31,30,31);

	protected static $_month_leaf = array("",31,29,31,30,31,30,31,31,30,31,30,31);

	/**

	 * Gets day of week, 0 = Sunday,... 6=Saturday.

	 * Algorithm from PEAR::Date_Calc

	 */

	public function getDayofWeek($year, $month, $day)

	{

		/*

		Pope Gregory removed 10 days - October 5 to October 14 - from the year 1582 and

		proclaimed that from that time onwards 3 days would be dropped from the calendar

		every 400 years.

		Thursday, October 4, 1582 (Julian) was followed immediately by Friday, October 15, 1582 (Gregorian).

		*/

		if ($year <= 1582)

		{

			if ($year < 1582 ||

				($year == 1582 && ($month < 10 || ($month == 10 && $day < 15))))

			{

				$greg_correction = 3;

			}

			else

			{

				$greg_correction = 0;

			}

		}

		else

		{

			$greg_correction = 0;

		}

		if($month > 2)

		    $month -= 2;

		else

		{

		    $month += 10;

		    $year--;

		}

		$day =  floor((13 * $month - 1) / 5) +

		        $day + ($year % 100) +

		        floor(($year % 100) / 4) +

		        floor(($year / 100) / 4) - 2 *

		        floor($year / 100) + 77 + $greg_correction;

		return $day - 7 * floor($day / 7);

	}

	/**

	 * Checks for leap year, returns true if it is. No 2-digit year check. Also

	 * handles julian calendar correctly.

	 * @param float year to check

	 * @return boolean true if is leap year

	 */

	public function isLeapYear($year)

	{

		$year = $this->digitCheck($year);

		if ($year % 4 != 0)

			return false;

		if ($year % 400 == 0)

			return true;

		// if gregorian calendar (>1582), century not-divisible by 400 is not leap

		else if ($year > 1582 && $year % 100 == 0 )

			return false;

		return true;

	}

	/**

	 * Fix 2-digit years. Works for any century.

	 * Assumes that if 2-digit is more than 30 years in future, then previous century.

	 * @return integer change two digit year into multiple digits

	 */

	protected function digitCheck($y)

	{

		if ($y < 100){

			$yr = (integer) date("Y");

			$century = (integer) ($yr /100);

			if ($yr%100 > 50) {

				$c1 = $century + 1;

				$c0 = $century;

			} else {

				$c1 = $century;

				$c0 = $century - 1;

			}

			$c1 *= 100;

			// if 2-digit year is less than 30 years in future, set it to this century

			// otherwise if more than 30 years in future, then we set 2-digit year to the prev century.

			if (($y + $c1) < $yr+30) $y = $y + $c1;

			else $y = $y + $c0*100;

		}

		return $y;

	}

	public function get4DigitYear($y)

	{

		return $this->digitCheck($y);

	}

	/**

	 * @return integer get local time zone offset from GMT

	 */

	public function getGMTDiff()

	{

		static $TZ;

		if (isset($TZ)) return $TZ;

		$TZ = mktime(0,0,0,1,2,1970) - gmmktime(0,0,0,1,2,1970);

		return $TZ;

	}

	/**

	 * @return array an array with date info.

	 */

	function getDate($d=false,$fast=false)

	{

		if ($d === false) return getdate();

		// check if number in 32-bit signed range

		if ((abs($d) <= 0x7FFFFFFF))

		{

			if (!defined('ADODB_NO_NEGATIVE_TS') || $d >= 0) // if windows, must be +ve integer

				return @getdate($d);

		}

		return $this->_getDateInternal($d);

	}

	/**

	 * Low-level function that returns the getdate() array. We have a special

	 * $fast flag, which if set to true, will return fewer array values,

	 * and is much faster as it does not calculate dow, etc.

	 * @param float original date

	 * @param boolean false to compute the day of the week, default is true

	 * @param boolean true to calculate the GMT dates

	 * @return array an array with date info.

	 */

	protected function _getDateInternal($origd=false,$fast=true,$is_gmt=false)

	{

		static $YRS;

		$d =  $origd - ($is_gmt ? 0 : $this->getGMTDiff());

		$_day_power = 86400;

		$_hour_power = 3600;

		$_min_power = 60;

		if ($d < -12219321600)

			$d -= 86400*10; // if 15 Oct 1582 or earlier, gregorian correction

		$_month_table_normal =& self::$_month_normal;

		$_month_table_leaf = & self::$_month_leaf;

		$d366 = $_day_power * 366;

		$d365 = $_day_power * 365;

		if ($d < 0)

		{

			if (empty($YRS))

				$YRS = array(

					1970 => 0,

					1960 => -315619200,

					1950 => -631152000,

					1940 => -946771200,

					1930 => -1262304000,

					1920 => -1577923200,

					1910 => -1893456000,

					1900 => -2208988800,

					1890 => -2524521600,

					1880 => -2840140800,

					1870 => -3155673600,

					1860 => -3471292800,

					1850 => -3786825600,

					1840 => -4102444800,

					1830 => -4417977600,

					1820 => -4733596800,

					1810 => -5049129600,

					1800 => -5364662400,

					1790 => -5680195200,

					1780 => -5995814400,

					1770 => -6311347200,

					1760 => -6626966400,

					1750 => -6942499200,

					1740 => -7258118400,

					1730 => -7573651200,

					1720 => -7889270400,

					1710 => -8204803200,

					1700 => -8520336000,

					1690 => -8835868800,

					1680 => -9151488000,

					1670 => -9467020800,

					1660 => -9782640000,

					1650 => -10098172800,

					1640 => -10413792000,

					1630 => -10729324800,

					1620 => -11044944000,

					1610 => -11360476800,

					1600 => -11676096000);

			if ($is_gmt)

				$origd = $d;

			// The valid range of a 32bit signed timestamp is typically from

			// Fri, 13 Dec 1901 20:45:54 GMT to Tue, 19 Jan 2038 03:14:07 GMT

			//

			# old algorithm iterates through all years. new algorithm does it in

			# 10 year blocks

			/*

			# old algo

			for ($a = 1970 ; --$a >= 0;) {

				$lastd = $d;

				if ($leaf = _adodb_is_leap_year($a)) $d += $d366;

				else $d += $d365;

				if ($d >= 0) {

					$year = $a;

					break;

				}

			}

			*/

			$lastsecs = 0;

			$lastyear = 1970;

			foreach($YRS as $year => $secs)

			{

				if ($d >= $secs)

				{

					$a = $lastyear;

					break;

				}

				$lastsecs = $secs;

				$lastyear = $year;

			}

			$d -= $lastsecs;

			if (!isset($a)) $a = $lastyear;

			//echo ' yr=',$a,' ', $d,'.';

			for (; --$a >= 0;)

			{

				$lastd = $d;

				if ($leaf = $this->isLeapYear($a))

					$d += $d366;

				else

					$d += $d365;

				if ($d >= 0)

				{

					$year = $a;

					break;

				}

			}

			/**/

			$secsInYear = 86400 * ($leaf ? 366 : 365) + $lastd;

			$d = $lastd;

			$mtab = ($leaf) ? $_month_table_leaf : $_month_table_normal;

			for ($a = 13 ; --$a > 0;)

			{

				$lastd = $d;

				$d += $mtab[$a] * $_day_power;

				if ($d >= 0)

				{

					$month = $a;

					$ndays = $mtab[$a];

					break;

				}

			}

			$d = $lastd;

			$day = $ndays + ceil(($d+1) / ($_day_power));

			$d += ($ndays - $day+1)* $_day_power;

			$hour = floor($d/$_hour_power);

		} else {

			for ($a = 1970 ;; $a++)

			{

				$lastd = $d;

				if ($leaf = $this->isLeapYear($a)) $d -= $d366;

				else $d -= $d365;

				if ($d < 0)

				{

					$year = $a;

					break;

				}

			}

			$secsInYear = $lastd;

			$d = $lastd;

			$mtab = ($leaf) ? $_month_table_leaf : $_month_table_normal;

			for ($a = 1 ; $a <= 12; $a++)

			{

				$lastd = $d;

				$d -= $mtab[$a] * $_day_power;

				if ($d < 0)

				{

					$month = $a;

					$ndays = $mtab[$a];

					break;

				}

			}

			$d = $lastd;

			$day = ceil(($d+1) / $_day_power);

			$d = $d - ($day-1) * $_day_power;

			$hour = floor($d /$_hour_power);

		}

		$d -= $hour * $_hour_power;

		$min = floor($d/$_min_power);

		$secs = $d - $min * $_min_power;

		if ($fast)

		{

			return array(

			'seconds' => $secs,

			'minutes' => $min,

			'hours' => $hour,

			'mday' => $day,

			'mon' => $month,

			'year' => $year,

			'yday' => floor($secsInYear/$_day_power),

			'leap' => $leaf,

			'ndays' => $ndays

			);

		}

		$dow = $this->getDayofWeek($year,$month,$day);

		return array(

			'seconds' => $secs,

			'minutes' => $min,

			'hours' => $hour,

			'mday' => $day,

			'wday' => $dow,

			'mon' => $month,

			'year' => $year,

			'yday' => floor($secsInYear/$_day_power),

			'weekday' => gmdate('l',$_day_power*(3+$dow)),

			'month' => gmdate('F',mktime(0,0,0,$month,2,1971)),

		);

	}

	/**

	 * @return boolean true if valid date, semantic check only.

	 */

	public function isValidDate($y,$m,$d)

	{

		if ($this->isLeapYear($y))

			$marr =& self::$_month_leaf;

		else

			$marr =& self::$_month_normal;

		if ($m > 12 || $m < 1) return false;

		if ($d > 31 || $d < 1) return false;

		if ($marr[$m] < $d) return false;

		if ($y < 1000 && $y > 3000) return false;

		return true;

	}

	/**

	 * @return string formatted date based on timestamp $d

	 */

	function formatDate($fmt,$d=false,$is_gmt=false)

	{

		if ($d === false)

			return ($is_gmt)? @gmdate($fmt): @date($fmt);

		// check if number in 32-bit signed range

		if ((abs($d) <= 0x7FFFFFFF))

		{

			// if windows, must be +ve integer

			if (!defined('ADODB_NO_NEGATIVE_TS') || $d >= 0)

				return ($is_gmt)? @gmdate($fmt,$d): @date($fmt,$d);

		}

		$_day_power = 86400;

		$arr = $this->getDate($d,true,$is_gmt);

		$year = $arr['year'];

		$month = $arr['mon'];

		$day = $arr['mday'];

		$hour = $arr['hours'];

		$min = $arr['minutes'];

		$secs = $arr['seconds'];

		$max = strlen($fmt);

		$dates = '';

		$isphp5 = PHP_VERSION >= 5;

		/*

			at this point, we have the following integer vars to manipulate:

			$year, $month, $day, $hour, $min, $secs

		*/

		for ($i=0; $i < $max; $i++)

		{

			switch($fmt[$i])

			{

			case 'T': $dates .= date('T');break;

			// YEAR

			case 'L': $dates .= $arr['leap'] ? '1' : '0'; break;

			case 'r': // Thu, 21 Dec 2000 16:01:07 +0200

				// 4.3.11 uses '04 Jun 2004'

				// 4.3.8 uses  ' 4 Jun 2004'

				$dates .= gmdate('D',$_day_power*(3+$this->getDayOfWeek($year,$month,$day))).', '

					. ($day<10?'0'.$day:$day) . ' '.date('M',mktime(0,0,0,$month,2,1971)).' '.$year.' ';

				if ($hour < 10) $dates .= '0'.$hour; else $dates .= $hour;

				if ($min < 10) $dates .= ':0'.$min; else $dates .= ':'.$min;

				if ($secs < 10) $dates .= ':0'.$secs; else $dates .= ':'.$secs;

				$gmt = $this->getGMTDiff();

				if ($isphp5)

					$dates .= sprintf(' %s%04d',($gmt<=0)?'+':'-',abs($gmt)/36);

				else

					$dates .= sprintf(' %s%04d',($gmt<0)?'+':'-',abs($gmt)/36);

				break;

			case 'Y': $dates .= $year; break;

			case 'y': $dates .= substr($year,strlen($year)-2,2); break;

			// MONTH

			case 'm': if ($month<10) $dates .= '0'.$month; else $dates .= $month; break;

			case 'Q': $dates .= ($month+3)>>2; break;

			case 'n': $dates .= $month; break;

			case 'M': $dates .= date('M',mktime(0,0,0,$month,2,1971)); break;

			case 'F': $dates .= date('F',mktime(0,0,0,$month,2,1971)); break;

			// DAY

			case 't': $dates .= $arr['ndays']; break;

			case 'z': $dates .= $arr['yday']; break;

			case 'w': $dates .= $this->getDayOfWeek($year,$month,$day); break;

			case 'l': $dates .= gmdate('l',$_day_power*(3+$this->getDayOfWeek($year,$month,$day))); break;

			case 'D': $dates .= gmdate('D',$_day_power*(3+$this->getDayOfWeek($year,$month,$day))); break;

			case 'j': $dates .= $day; break;

			case 'd': if ($day<10) $dates .= '0'.$day; else $dates .= $day; break;

			case 'S':

				$d10 = $day % 10;

				if ($d10 == 1) $dates .= 'st';

				else if ($d10 == 2 && $day != 12) $dates .= 'nd';

				else if ($d10 == 3) $dates .= 'rd';

				else $dates .= 'th';

				break;

			// HOUR

			case 'Z':

				$dates .= ($is_gmt) ? 0 : -$this->getGMTDiff(); break;

			case 'O':

				$gmt = ($is_gmt) ? 0 : $this->getGMTDiff();

				if ($isphp5)

					$dates .= sprintf('%s%04d',($gmt<=0)?'+':'-',abs($gmt)/36);

				else

					$dates .= sprintf('%s%04d',($gmt<0)?'+':'-',abs($gmt)/36);

				break;

			case 'H':

				if ($hour < 10) $dates .= '0'.$hour;

				else $dates .= $hour;

				break;

			case 'h':

				if ($hour > 12) $hh = $hour - 12;

				else {

					if ($hour == 0) $hh = '12';

					else $hh = $hour;

				}

				if ($hh < 10) $dates .= '0'.$hh;

				else $dates .= $hh;

				break;

			case 'G':

				$dates .= $hour;

				break;

			case 'g':

				if ($hour > 12) $hh = $hour - 12;

				else {

					if ($hour == 0) $hh = '12';

					else $hh = $hour;

				}

				$dates .= $hh;

				break;

			// MINUTES

			case 'i': if ($min < 10) $dates .= '0'.$min; else $dates .= $min; break;

			// SECONDS

			case 'U': $dates .= $d; break;

			case 's': if ($secs < 10) $dates .= '0'.$secs; else $dates .= $secs; break;

			// AM/PM

			// Note 00:00 to 11:59 is AM, while 12:00 to 23:59 is PM

			case 'a':

				if ($hour>=12) $dates .= 'pm';

				else $dates .= 'am';

				break;

			case 'A':

				if ($hour>=12) $dates .= 'PM';

				else $dates .= 'AM';

				break;

			default:

				$dates .= $fmt[$i]; break;

			// ESCAPE

			case "\\":

				$i++;

				if ($i < $max) $dates .= $fmt[$i];

				break;

			}

		}

		return $dates;

	}

	/**

	 * Not a very fast algorithm - O(n) operation. Could be optimized to O(1).

	 * @return integer|float a timestamp given a local time. Originally by jackbbs.

     */

	function getTimeStamp($hr,$min,$sec,$mon=false,$day=false,$year=false,$is_gmt=false)

	{

		if ($mon === false)

			return $is_gmt? @gmmktime($hr,$min,$sec): @mktime($hr,$min,$sec);

		// for windows, we don't check 1970 because with timezone differences,

		// 1 Jan 1970 could generate negative timestamp, which is illegal

		if (1971 <= $year && $year < 2038 || !defined('ADODB_NO_NEGATIVE_TS')

			&& (1901 < $year && $year < 2038))

		{

			return $is_gmt ? @gmmktime($hr,$min,$sec,$mon,$day,$year)

						    : @mktime($hr,$min,$sec,$mon,$day,$year);

		}

		$gmt_different = ($is_gmt) ? 0 : $this->getGMTDiff();

		/*

		# disabled because some people place large values in $sec.

		# however we need it for $mon because we use an array...

		$hr = intval($hr);

		$min = intval($min);

		$sec = intval($sec);

		*/

		$mon = (int)$mon;

		$day = (int)$day;

		$year = (int)$year;

		$year = $this->digitCheck($year);

		if ($mon > 12)

		{

			$y = floor($mon / 12);

			$year += $y;

			$mon -= $y*12;

		}

		else if ($mon < 1)

		{

			$y = ceil((1-$mon) / 12);

			$year -= $y;

			$mon += $y*12;

		}

		$_day_power = 86400;

		$_hour_power = 3600;

		$_min_power = 60;

		$_month_table_normal = & self::$_month_normal;

		$_month_table_leaf = & self::$_month_leaf;

		$_total_date = 0;

		if ($year >= 1970)

		{

			for ($a = 1970 ; $a <= $year; $a++)

			{

				$leaf = $this->isLeapYear($a);

				if ($leaf == true) {

					$loop_table = $_month_table_leaf;

					$_add_date = 366;

				} else {

					$loop_table = $_month_table_normal;

					$_add_date = 365;

				}

				if ($a < $year) {

					$_total_date += $_add_date;

				} else {

					for($b=1;$b<$mon;$b++) {

						$_total_date += $loop_table[$b];

					}

				}

			}

			$_total_date +=$day-1;

			$ret = $_total_date * $_day_power + $hr * $_hour_power + $min * $_min_power + $sec + $gmt_different;

		} else {

			for ($a = 1969 ; $a >= $year; $a--) {

				$leaf = $this->isLeapYear($a);

				if ($leaf == true) {

					$loop_table = $_month_table_leaf;

					$_add_date = 366;

				} else {

					$loop_table = $_month_table_normal;

					$_add_date = 365;

				}

				if ($a > $year) { $_total_date += $_add_date;

				} else {

					for($b=12;$b>$mon;$b--) {

						$_total_date += $loop_table[$b];

					}

				}

			}

			$_total_date += $loop_table[$mon] - $day;

			$_day_time = $hr * $_hour_power + $min * $_min_power + $sec;

			$_day_time = $_day_power - $_day_time;

			$ret = -( $_total_date * $_day_power + $_day_time - $gmt_different);

			if ($ret < -12220185600) $ret += 10*86400; // if earlier than 5 Oct 1582 - gregorian correction

			else if ($ret < -12219321600) $ret = -12219321600; // if in limbo, reset to 15 Oct 1582.

		}

		//print " dmy=$day/$mon/$year $hr:$min:$sec => " .$ret;

		return $ret;

	}

}

?>