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<?php
/**
* CTimestamp class file.
*
* @author Wei Zhuo <weizhuo[at]gamil[dot]com>
* @link http://www.yiiframework.com/
* @copyright Copyright &copy; 2008-2010 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. False to use the current timestamp.
* @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.
*/
public static function getDate($d=false,$fast=false,$gmt=false)
{
if($gmt)
{
$tz = date_default_timezone_get();
date_default_timezone_set('GMT');
$result = getdate($d);
date_default_timezone_set($tz);
}
else
{
$result = getdate($d);
}
return $result;
}

/**
* 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,$d)
{
return checkdate($m, $d, $y);
}

/**
* Checks to see if the hour, minute and second are valid.
* @param integer hour
* @param integer minute
* @param integer second
* @param boolean whether the hours should be 0 through 23 (default) or 1 through 12.
* @return boolean true if valid date, semantic check only.
* @since 1.0.5
*/
public static function isValidTime($h,$m,$s,$hs24=true)
{
if($hs24 && ($h < 0 || $h > 23) || !$hs24 && ($h < 1 || $h > 12)) return false;
if($m > 59 || $m < 0) return false;
if($s > 59 || $s < 0) 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);
return $is_gmt ? @gmmktime($hr,$min,$sec,$mon,$day,$year) : @mktime($hr,$min,$sec,$mon,$day,$year);
}
}
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