Location: PHPKode > projects > MyBB - Bullitin Board > Upload/inc/functions_time.php
<?php
/** This file is distributed with MyBB under the BSD License package and modified to work with MyBB **/

/**
ADOdb Date Library, part of the ADOdb abstraction library
Download: http://phplens.com/phpeverywhere/

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 adodb_mktime().

This library replaces native functions as follows:

<pre>	
	getdate()  with  adodb_getdate()
	date()     with  adodb_date() 
	gmdate()   with  adodb_gmdate()
	mktime()   with  adodb_mktime()
	gmmktime() with  adodb_gmmktime()
	strftime() with  adodb_strftime()
	strftime() with  adodb_gmstrftime()
</pre>
	
The parameters are identical, except that adodb_date() accepts a subset
of date()'s field formats. Mktime() will convert from local time to GMT, 
and date() will convert from GMT to local time, but daylight savings is 
not handled currently.

This library is independant of the rest of ADOdb, and can be used
as standalone code.

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.

GREGORIAN CORRECTION

Pope Gregory shortened October of A.D. 1582 by ten days. Thursday, 
October 4, 1582 (Julian) was followed immediately by Friday, October 15, 
1582 (Gregorian). 

Since 0.06, we handle this correctly, so:

adodb_mktime(0,0,0,10,15,1582) - adodb_mktime(0,0,0,10,4,1582) 
	== 24 * 3600 (1 day)

=============================================================================

COPYRIGHT

(c) 2003-2005 John Lim and released under BSD-style license except for code by 
jackbbs, which includes adodb_mktime, adodb_get_gmt_diff, adodb_is_leap_year
and originally found at http://www.php.net/manual/en/function.mktime.php

=============================================================================

BUG REPORTS

These should be posted to the ADOdb forums at

	http://phplens.com/lens/lensforum/topics.php?id=4

=============================================================================
*/


/* Initialization */

/*
	Version Number
*/
define('ADODB_DATE_VERSION', 0.33);

$ADODB_DATETIME_CLASS = (PHP_VERSION >= 5.2);

/*
	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')) define('ADODB_NO_NEGATIVE_TS',1);

/**
	Returns day of week, 0 = Sunday,... 6=Saturday. 
	Algorithm from PEAR::Date_Calc
*/
function adodb_dow($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.
*/
function _adodb_is_leap_year($year) 
{
	if ($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;
}


/**
 checks for leap year, returns true if it is. Has 2-digit year check
*/
function adodb_is_leap_year($year) 
{
	return  _adodb_is_leap_year(adodb_year_digit_check($year));
}

/**
	Fix 2-digit years. Works for any century.
 	Assumes that if 2-digit is more than 30 years in future, then previous century.
*/
function adodb_year_digit_check($y) 
{
	if ($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;
}

function adodb_get_gmt_diff_ts($ts) 
{
	if (0 <= $ts && $ts <= 0x7FFFFFFF) { // check if number in 32-bit signed range) {
		$arr = getdate($ts);
		$y = $arr['year'];
		$m = $arr['mon'];
		$d = $arr['mday'];
		return adodb_get_gmt_diff($y,$m,$d);	
	} else {
		return adodb_get_gmt_diff(false,false,false);
	}
	
}

/**
 get local time zone offset from GMT. Does not handle historical timezones before 1970.
*/
function adodb_get_gmt_diff($y,$m,$d) 
{
static $TZ,$tzo;
global $ADODB_DATETIME_CLASS;

	if (!defined('ADODB_TEST_DATES')) $y = false;
	else if ($y < 1970 || $y >= 2038) $y = false;

	if ($ADODB_DATETIME_CLASS && $y !== false) {
		$dt = new DateTime();
		$dt->setISODate($y,$m,$d);
		if (empty($tzo)) {
			$tzo = new DateTimeZone(date_default_timezone_get());
		#	$tzt = timezone_transitions_get( $tzo );
		}
		return -$tzo->getOffset($dt);
	} else {
		if (isset($TZ)) return $TZ;
		$y = date('Y');
		$TZ = mktime(0,0,0,12,2,$y,0) - gmmktime(0,0,0,12,2,$y,0);
	}
	
	return $TZ;
}

/**
	Returns an array with date info.
*/
function adodb_getdate($d=false,$fast=false)
{
	if ($d === false) return getdate();
	if (!defined('ADODB_TEST_DATES')) {
		if ((abs($d) <= 0x7FFFFFFF)) { // check if number in 32-bit signed range
			if (!defined('ADODB_NO_NEGATIVE_TS') || $d >= 0) // if windows, must be +ve integer
				return @getdate($d);
		}
	}
	return _adodb_getdate($d);
}

$_month_table_normal = array("",31,28,31,30,31,30,31,31,30,31,30,31);
$_month_table_leaf = array("",31,29,31,30,31,30,31,31,30,31,30,31);

/**
	Low-level function that returns the getdate() array. We have a special
	$fast flag, which if set to true, will return fewer array values,
	and is much faster as it does not calculate dow, etc.
*/
function _adodb_getdate($origd=false,$fast=false,$is_gmt=false)
{
static $YRS;
global $_month_table_normal,$_month_table_leaf;

	$d =  $origd - ($is_gmt ? 0 : adodb_get_gmt_diff_ts($origd));
	$_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 = array("",31,28,31,30,31,30,31,31,30,31,30,31);
	$_month_table_leaf = array("",31,29,31,30,31,30,31,31,30,31,30,31);
	
	$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 ($leaf = _adodb_is_leap_year($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 ($leaf = _adodb_is_leap_year($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
		);
	}
	
	
	$dow = adodb_dow($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)),
		0 => $origd
	);
}

function adodb_tz_offset($gmt,$isphp5)
{
	$zhrs = abs($gmt)/3600;
	$hrs = floor($zhrs);
	if ($isphp5) 
		return sprintf('%s%02d%02d',($gmt<=0)?'+':'-',floor($zhrs),($zhrs-$hrs)*60); 
	else
		return sprintf('%s%02d%02d',($gmt<0)?'+':'-',floor($zhrs),($zhrs-$hrs)*60); 
	break;
}


function adodb_gmdate($fmt,$d=false)
{
	return adodb_date($fmt,$d,true);
}

// accepts unix timestamp and iso date format in $d
function adodb_date2($fmt, $d=false, $is_gmt=false)
{
	if ($d !== false) {
		if (!preg_match( 
			"|^([0-9]{4})[-/\.]?([0-9]{1,2})[-/\.]?([0-9]{1,2})[ -]?(([0-9]{1,2}):?([0-9]{1,2}):?([0-9\.]{1,4}))?|", 
			($d), $rr)) return adodb_date($fmt,false,$is_gmt);

		if ($rr[1] <= 100 && $rr[2]<= 1) return adodb_date($fmt,false,$is_gmt);
	
		// h-m-s-MM-DD-YY
		if (!isset($rr[5])) $d = adodb_mktime(0,0,0,$rr[2],$rr[3],$rr[1],false,$is_gmt);
		else $d = @adodb_mktime($rr[5],$rr[6],$rr[7],$rr[2],$rr[3],$rr[1],false,$is_gmt);
	}
	
	return adodb_date($fmt,$d,$is_gmt);
}


/**
	Return formatted date based on timestamp $d
*/
function adodb_date($fmt,$d=false,$is_gmt=false)
{
static $daylight;
global $ADODB_DATETIME_CLASS;

	if ($d === false) return ($is_gmt)? @gmdate($fmt): @date($fmt);
	if (!defined('ADODB_TEST_DATES')) {
		if ((abs($d) <= 0x7FFFFFFF)) { // check if number in 32-bit signed range
			if (!defined('ADODB_NO_NEGATIVE_TS') || $d >= 0) // if windows, must be +ve integer
				return ($is_gmt)? @gmdate($fmt,$d): @date($fmt,$d);

		}
	}
	$_day_power = 86400;
	
	$arr = _adodb_getdate($d,true,$is_gmt);
	
	if (!isset($daylight)) $daylight = function_exists('adodb_daylight_sv');
	if ($daylight) adodb_daylight_sv($arr, $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[$i]) {
		case 'T': 
			if ($ADODB_DATETIME_CLASS) {
				$dt = new DateTime();
				$dt->SetDate($year,$month,$day);
				$dates .= $dt->Format('T');
			} else
				$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+adodb_dow($year,$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;
			
			$gmt = adodb_get_gmt_diff($year,$month,$day);
			
			$dates .= ' '.adodb_tz_offset($gmt,$isphp5);
			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': $dates .= adodb_dow($year,$month,$day); break;
		case 'l': $dates .= gmdate('l',$_day_power*(3+adodb_dow($year,$month,$day))); break;
		case 'D': $dates .= gmdate('D',$_day_power*(3+adodb_dow($year,$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 : -adodb_get_gmt_diff($year,$month,$day); break;
		case 'O': 
			$gmt = ($is_gmt) ? 0 : adodb_get_gmt_diff($year,$month,$day);
			
			$dates .= adodb_tz_offset($gmt,$isphp5);
			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;
}

/**
	Returns a timestamp given a GMT/UTC time. 
	Note that $is_dst is not implemented and is ignored.
*/
function adodb_gmmktime($hr,$min,$sec,$mon=false,$day=false,$year=false,$is_dst=false)
{
	return adodb_mktime($hr,$min,$sec,$mon,$day,$year,$is_dst,true);
}

/**
	Return a timestamp given a local time. Originally by jackbbs.
	Note that $is_dst is not implemented and is ignored.
	
	Not a very fast algorithm - O(n) operation. Could be optimized to O(1).
	
	NOTE: returns time() when the year is > 9999
*/
function adodb_mktime($hr,$min,$sec,$mon=false,$day=false,$year=false,$is_dst=false,$is_gmt=false) 
{
	if (!defined('ADODB_TEST_DATES')) {

		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
		$usephpfns = (1971 < $year && $year < 2038
			|| !defined('ADODB_NO_NEGATIVE_TS') && (1901 < $year && $year < 2038)
			); 
			
		
		if ($usephpfns && ($year + $mon/12+$day/365.25+$hr/(24*365.25) >= 2038)) $usephpfns = false;
			
		if ($usephpfns) {
				return $is_gmt ?
					@gmmktime($hr,$min,$sec,$mon,$day,$year):
					@mktime($hr,$min,$sec,$mon,$day,$year);
		}
	}
	
	$gmt_different = ($is_gmt) ? 0 : adodb_get_gmt_diff($year,$mon,$day);

	/*
	# 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);
	*/
	$mon = intval($mon);
	$day = intval($day);
	$year = intval($year);
	
	
	$year = adodb_year_digit_check($year);

	if ($mon > 12) {
		$y = floor(($mon-1)/ 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 = array("",31,28,31,30,31,30,31,31,30,31,30,31);
	$_month_table_leaf = array("",31,29,31,30,31,30,31,31,30,31,30,31);
	
	$_total_date = 0;
	if($year > 9999) {
		return time();
	} else if ($year >= 1970) {
		for ($a = 1970 ; $a <= $year; $a++) {
			$leaf = _adodb_is_leap_year($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--) {
			$leaf = _adodb_is_leap_year($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;
}

function adodb_gmstrftime($fmt, $ts=false)
{
	return adodb_strftime($fmt,$ts,true);
}

// hack - convert to adodb_date
function adodb_strftime($fmt, $ts=false,$is_gmt=false)
{
global $ADODB_DATE_LOCALE;

	if (!defined('ADODB_TEST_DATES')) {
		if ((abs($ts) <= 0x7FFFFFFF)) { // check if number in 32-bit signed range
			if (!defined('ADODB_NO_NEGATIVE_TS') || $ts >= 0) // if windows, must be +ve integer
				return ($is_gmt)? @gmstrftime($fmt,$ts): @strftime($fmt,$ts);

		}
	}
	
	if (empty($ADODB_DATE_LOCALE)) {
	/*
		$tstr = strtoupper(gmstrftime('%c',31366800)); // 30 Dec 1970, 1 am
		$sep = substr($tstr,2,1);
		$hasAM = strrpos($tstr,'M') !== false;
	*/
		# see http://phplens.com/lens/lensforum/msgs.php?id=14865 for reasoning, and changelog for version 0.24
		$dstr = gmstrftime('%x',31366800); // 30 Dec 1970, 1 am
		$sep = substr($dstr,2,1);
		$tstr = strtoupper(gmstrftime('%X',31366800)); // 30 Dec 1970, 1 am
		$hasAM = strrpos($tstr,'M') !== false;
		
		$ADODB_DATE_LOCALE = array();
		$ADODB_DATE_LOCALE[] =  strncmp($tstr,'30',2) == 0 ? 'd'.$sep.'m'.$sep.'y' : 'm'.$sep.'d'.$sep.'y';	
		$ADODB_DATE_LOCALE[]  = ($hasAM) ? 'h:i:s a' : 'H:i:s';
			
	}
	$inpct = false;
	$fmtdate = '';
	for ($i=0,$max = strlen($fmt); $i < $max; $i++) {
		$ch = $fmt[$i];
		if ($ch == '%') {
			if ($inpct) {
				$fmtdate .= '%';
				$inpct = false;
			} else
				$inpct = true;
		} else if ($inpct) {
		
			$inpct = false;
			switch($ch) {
			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9':
			case 'E':
			case 'O':
				/* ignore format modifiers */
				$inpct = true; 
				break;
				
			case 'a': $fmtdate .= 'D'; break;
			case 'A': $fmtdate .= 'l'; break;
			case 'h':
			case 'b': $fmtdate .= 'M'; break;
			case 'B': $fmtdate .= 'F'; break;
			case 'c': $fmtdate .= $ADODB_DATE_LOCALE[0].$ADODB_DATE_LOCALE[1]; break;
			case 'C': $fmtdate .= '\C?'; break; // century
			case 'd': $fmtdate .= 'd'; break;
			case 'D': $fmtdate .= 'm/d/y'; break;
			case 'e': $fmtdate .= 'j'; break;
			case 'g': $fmtdate .= '\g?'; break; //?
			case 'G': $fmtdate .= '\G?'; break; //?
			case 'H': $fmtdate .= 'H'; break;
			case 'I': $fmtdate .= 'h'; break;
			case 'j': $fmtdate .= '?z'; $parsej = true; break; // wrong as j=1-based, z=0-basd
			case 'm': $fmtdate .= 'm'; break;
			case 'M': $fmtdate .= 'i'; break;
			case 'n': $fmtdate .= "\n"; break;
			case 'p': $fmtdate .= 'a'; break;
			case 'r': $fmtdate .= 'h:i:s a'; break;
			case 'R': $fmtdate .= 'H:i:s'; break;
			case 'S': $fmtdate .= 's'; break;
			case 't': $fmtdate .= "\t"; break;
			case 'T': $fmtdate .= 'H:i:s'; break;
			case 'u': $fmtdate .= '?u'; $parseu = true; break; // wrong strftime=1-based, date=0-based
			case 'U': $fmtdate .= '?U'; $parseU = true; break;// wrong strftime=1-based, date=0-based
			case 'x': $fmtdate .= $ADODB_DATE_LOCALE[0]; break;
			case 'X': $fmtdate .= $ADODB_DATE_LOCALE[1]; break;
			case 'w': $fmtdate .= '?w'; $parseu = true; break; // wrong strftime=1-based, date=0-based
			case 'W': $fmtdate .= '?W'; $parseU = true; break;// wrong strftime=1-based, date=0-based
			case 'y': $fmtdate .= 'y'; break;
			case 'Y': $fmtdate .= 'Y'; break;
			case 'Z': $fmtdate .= 'T'; break;
			}
		} else if (('A' <= ($ch) && ($ch) <= 'Z' ) || ('a' <= ($ch) && ($ch) <= 'z' ))
			$fmtdate .= "\\".$ch;
		else
			$fmtdate .= $ch;
	}
	//echo "fmt=",$fmtdate,"<br>";
	if ($ts === false) $ts = time();
	$ret = adodb_date($fmtdate, $ts, $is_gmt);
	return $ret;
}

?>
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