diff options
| author | wei <> | 2006-08-30 08:40:02 +0000 |
|---|---|---|
| committer | wei <> | 2006-08-30 08:40:02 +0000 |
| commit | 92443cbce888aceeedead68938c03006e80bb379 (patch) | |
| tree | 6284ea4c5e536b4723f8e30dc9abe4731093d654 /framework/Util/TDateTimeStamp.php | |
| parent | adab65ab49f125b39bf819abe68b0790cbf394df (diff) | |
Added TDateTimeStamp class for supporting time stamps outside 1970-2038 using float
Diffstat (limited to 'framework/Util/TDateTimeStamp.php')
| -rw-r--r-- | framework/Util/TDateTimeStamp.php | 700 |
1 files changed, 700 insertions, 0 deletions
diff --git a/framework/Util/TDateTimeStamp.php b/framework/Util/TDateTimeStamp.php new file mode 100644 index 00000000..6a5bd9e6 --- /dev/null +++ b/framework/Util/TDateTimeStamp.php @@ -0,0 +1,700 @@ +<?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 © 2006 PradoSoft
+ * @license http://www.pradosoft.com/license/
+ * @version $Revision: 30/08/2006 $
+ * @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')) 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 $Revision: $ 30/08/2006 $
+ * @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
+ * $fast flag, which if set to true, will return fewer array values,
+ * and is much faster as it does not calculate dow, etc.
+ * @param float orginal date
+ * @param boolean false to compute the day of the week, default is true
+ * @param boolean true to calculate the GMT dates
+ * @return array an array with date info.
+ */
+ protected function _getDateInternal($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)),
+ 0 => $origd
+ );
+ }
+
+ /**
+ * @return boolean true if valid date, semantic check only.
+ */
+ public function isValidDate($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);
+ */
+ $mon = intval($mon);
+ $day = intval($day);
+ $year = intval($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;
+ }
+}
+
+?>
\ No newline at end of file |