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<?php
/**
* CTimestamp class file.
*
* @author Wei Zhuo <weizhuo[at]gamil[dot]com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2009 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
/**
* CTimestamp represents a timestamp.
*
* This class was adapted from the ADOdb Date Library, as part of
* the {@link http://phplens.com/phpeverywhere/ ADOdb abstraction library}.
* The original source code was released under both BSD and GNU Lesser GPL
* library license, with the following copyright notice:
* Copyright (c) 2000, 2001, 2002, 2003, 2004 John Lim
* All rights reserved.
*
* PHP native date static 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 static 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 static 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 $Id$
* @package system.utils
* @since 1.0
*/
class CTimestamp
{
private static $_monthNormal=array("",31,28,31,30,31,30,31,31,30,31,30,31);
private static $_monthLeaf=array("",31,29,31,30,31,30,31,31,30,31,30,31);
/**
* Gets day of week, 0 = Sunday,... 6=Saturday.
* Algorithm from PEAR::Date_Calc
* @param integer year
* @param integer month
* @param integer day
* @return integer day of week
*/
public static function getDayofWeek($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 integer year to check
* @return boolean true if is leap year
*/
public static function isLeapYear($year)
{
$year = self::digitCheck($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 && $year % 100 == 0 )
return false;
return true;
}
/**
* Fix 2-digit years. Works for any century.
* Assumes that if 2-digit is more than 30 years in future, then previous century.
* @param integer year
* @return integer change two digit year into multiple digits
*/
protected static function digitCheck($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 $y;
}
/**
* Returns 4-digit representation of the year.
* @param integer year
* @return integer 4-digit representation of the year
*/
public static function get4DigitYear($y)
{
return self::digitCheck($y);
}
/**
* @return integer get local time zone offset from GMT
*/
public static 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 $TZ;
}
/**
* Returns the getdate() array.
* @param integer original date timestamp
* @return array an array with date info.
*/
public static function getDate($d=false,$fast=false)
{
if ($d === false) return getdate();
// check if number in 32-bit signed range
if ((abs($d) <= 0x7FFFFFFF))
{
if ($d >= 0) // if windows, must be +ve integer
return @getdate($d);
}
return self::getDateInternal($d);
}
/**
* Low-level static function that returns the getdate() array. We have a special
* $fast flag, which if set to true, will return fewer array values,
* and is much faster as it does not calculate dow, etc.
* @param float original date
* @param boolean false to compute the day of the week, default is true
* @param boolean true to calculate the GMT dates
* @return array an array with date info.
*/
private static function getDateInternal($origd=false,$fast=true,$is_gmt=false)
{
static $YRS;
$d = $origd - ($is_gmt ? 0 : self::getGMTDiff());
$_day_power = 86400;
$_hour_power = 3600;
$_min_power = 60;
if ($d < -12219321600)
$d -= 86400*10; // if 15 Oct 1582 or earlier, gregorian correction
$_month_table_normal =& self::$_monthNormal;
$_month_table_leaf = & self::$_monthLeaf;
$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 = self::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 = self::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
);
}
$dow = self::getDayofWeek($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)),
0 => $origd
);
}
/**
* Checks to see if the year, month, day are valid combination.
* @param integer year
* @param integer month
* @param integer day
* @return boolean true if valid date, semantic check only.
*/
public static function isValidDate($y,$m,$d)
{
if (self::isLeapYear($y))
$marr =& self::$_monthLeaf;
else
$marr =& self::$_monthNormal;
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;
}
/**
* Formats a timestamp to a date string.
* @param string format pattern
* @param integer timestamp
* @param boolean whether this is a GMT timestamp
* @return string formatted date based on timestamp $d
*/
public static function formatDate($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($d) <= 0x7FFFFFFF))
{
// if windows, must be +ve integer
if ($d >= 0)
return ($is_gmt)? @gmdate($fmt,$d): @date($fmt,$d);
}
$_day_power = 86400;
$arr = self::getDate($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 = '';
/*
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+self::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 = self::getGMTDiff();
$dates .= sprintf(' %s%04d',($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': $dates .= self::getDayOfWeek($year,$month,$day); break;
case 'l': $dates .= gmdate('l',$_day_power*(3+self::getDayOfWeek($year,$month,$day))); break;
case 'D': $dates .= gmdate('D',$_day_power*(3+self::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 : -self::getGMTDiff(); break;
case 'O':
$gmt = ($is_gmt) ? 0 : self::getGMTDiff();
$dates .= sprintf('%s%04d',($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 $dates;
}
/**
* Generates a timestamp.
* Not a very fast algorithm - O(n) operation. Could be optimized to O(1).
* @param integer hour
* @param integer minute
* @param integer second
* @param integer month
* @param integer day
* @param integer year
* @param boolean whether this is GMT time
* @return integer|float a timestamp given a local time. Originally by jackbbs.
*/
public static function getTimestamp($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)
{
return $is_gmt ? @gmmktime($hr,$min,$sec,$mon,$day,$year)
: @mktime($hr,$min,$sec,$mon,$day,$year);
}
$gmt_different = ($is_gmt) ? 0 : self::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);
*/
$mon = intval($mon);
$day = intval($day);
$year = intval($year);
$year = self::digitCheck($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;
$_month_table_normal = & self::$_monthNormal;
$_month_table_leaf = & self::$_monthLeaf;
$_total_date = 0;
if ($year >= 1970)
{
for ($a = 1970 ; $a <= $year; $a++)
{
$leaf = self::isLeapYear($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--) {
$leaf = self::isLeapYear($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.
}
return $ret;
}
}
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