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adodb-time.inc.php
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Fri, Nov 21, 2:55 AM

adodb-time.inc.php
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<?php
/**
ADOdb Date Library, part of the ADOdb abstraction library
Download: http://php.weblogs.com/adodb_date_time_library
=============================================================================
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
=============================================================================
*/
defined('FULL_PATH') or die('restricted access!');
define('ADODB_DATE_VERSION', 0.21);
if (!defined('ADODB_ALLOW_NEGATIVE_TS')) define('ADODB_NO_NEGATIVE_TS',1);
function adodb_date_test_date($y1,$m,$d=13)
{
$t = adodb_mktime(0,0,0,$m,$d,$y1);
$rez = adodb_date('Y-n-j H:i:s',$t);
if ("$y1-$m-$d 00:00:00" != $rez) {
print "<b>$y1 error, expected=$y1-$m-$d 00:00:00, adodb=$rez</b><br>";
return false;
}
return true;
}
function adodb_date_test_strftime($fmt)
{
$s1 = strftime($fmt);
$s2 = adodb_strftime($fmt);
if ($s1 == $s2) return true;
echo "error for $fmt, strftime=$s1, $adodb=$s2<br>";
return false;
}
/**
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;
}
/**
get local time zone offset from GMT
*/
function adodb_get_gmt_diff()
{
static $TZ;
if (isset($TZ)) return $TZ;
$TZ = mktime(0,0,0,1,2,1970,0) - gmmktime(0,0,0,1,2,1970,0);
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);
}
/**
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;
$d = $origd - ($is_gmt ? 0 : adodb_get_gmt_diff());
$_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 => $origd
);
}
function adodb_gmdate($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]);
else $d = @adodb_mktime($rr[5],$rr[6],$rr[7],$rr[2],$rr[3],$rr[1]);
}
return adodb_date($fmt,$d,$is_gmt);
}
/**
Return formatted date based on timestamp $d
*/
function adodb_date($fmt,$d=false,$is_gmt=false)
{
static $daylight;
if ($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 = '';
/*
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+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();
$dates .= sprintf(' %s%04d',($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': $dates .= adodb_dow($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(); break;
case 'O':
$gmt = ($is_gmt) ? 0 : adodb_get_gmt_diff();
$dates .= sprintf('%s%04d',($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;
}
/**
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 $is_dst is not implemented and is ignored.
Not a very fast algorithm - O(n) operation. Could be optimized to O(1).
*/
function adodb_mktime($hr = null, $min = null, $sec = null, $mon = null, $day = null, $year = null,$is_dst=false,$is_gmt=false)
{
if( !isset($hr) ) $hr = adodb_date('H');
if( !isset($min) ) $min = adodb_date('i');
if( !isset($sec) ) $sec = adodb_date('s');
if( !isset($mon) ) $mon = adodb_date('m');
if( !isset($day) ) $day = adodb_date('d');
if( !isset($year) ) $year = adodb_date('Y');
if (!defined('ADODB_TEST_DATES')) {
if ($mon === false || !isset($mon) ) {
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 : adodb_get_gmt_diff();
/*
# 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 / 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 >= 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;
$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-basde
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-basde
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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