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includes/functions.php

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// Add function mkrealdate for Birthday MOD
// the originate php "mktime()", does not work proberly on all OS, especially when going back in time
// before year 1970 (year 0), this function "mkrealtime()", has a mutch larger valid date range,
// from 1901 - 2099. it returns a "like" UNIX timestamp divided by 86400, so
// calculation from the originate php date and mktime is easy.
// mkrealdate, returns the number of day (with sign) from 1.1.1970.

function mkrealdate($day,$month,$birth_year)
{
// range check months
if ($month<1 || $month>12) return "error";
// range check days
switch ($month)
{
case 1: if ($day>31) return "error";break;
case 2: if ($day>29) return "error";
$epoch=$epoch+31;break;
case 3: if ($day>31) return "error";
$epoch=$epoch+59;break;
case 4: if ($day>30) return "error" ;
$epoch=$epoch+90;break;
case 5: if ($day>31) return "error";
$epoch=$epoch+120;break;
case 6: if ($day>30) return "error";
$epoch=$epoch+151;break;
case 7: if ($day>31) return "error";
$epoch=$epoch+181;break;
case 8: if ($day>31) return "error";
$epoch=$epoch+212;break;
case 9: if ($day>30) return "error";
$epoch=$epoch+243;break;
case 10: if ($day>31) return "error";
$epoch=$epoch+273;break;
case 11: if ($day>30) return "error";
$epoch=$epoch+304;break;
case 12: if ($day>31) return "error";
$epoch=$epoch+334;break;
}
$epoch=$epoch+$day;
$epoch_Y=sqrt(($birth_year-1970)*($birth_year-1970));
$leapyear=round((($epoch_Y+2) / 4)-.5);
if (($epoch_Y+2)%4==0)
{// curent year is leapyear
$leapyear--;
if ($birth_year >1970 && $month>=3) $epoch=$epoch+1;
if ($birth_year <1970 && $month<3) $epoch=$epoch-1;
} else if ($month==2 && $day>28) return "error";//only 28 days in feb.
//year
if ($birth_year>1970)
$epoch=$epoch+$epoch_Y*365-1+$leapyear;
else
$epoch=$epoch-$epoch_Y*365-1-$leapyear;
return $epoch;
}

// Add function realdate for Birthday MOD
// the originate php "date()", does not work proberly on all OS, especially when going back in time
// before year 1970 (year 0), this function "realdate()", has a mutch larger valid date range,
// from 1901 - 2099. it returns a "like" UNIX date format (only date, related letters may be used, due to the fact that
// the given date value should already be divided by 86400 - leaving no time information left)
// a input like a UNIX timestamp divided by 86400 is expected, so
// calculation from the originate php date and mktime is easy.
// e.g. realdate ("m d Y", 3) returns the string "1 3 1970"

// UNIX users should replace this function with the below code, since this should be faster
//
//function realdate($date_syntax="Ymd",$date=0)
//{ return create_date($date_syntax,$date*86400+1,0); }

function realdate($date_syntax="Ymd",$date=0)
{
global $lang;
$i=2;
if ($date>=0)
{
return create_date($date_syntax,$date*86400+1,0);
} else
{
$year= -(date%1461);
$days = $date + $year*1461;
while ($days<0)
{
$year--;
$days+=365;
if ($i++==3)
{
$i=0;
$days++;
}
}
}
$leap_year = ($i==0) ? TRUE : FALSE;
$months_array = ($i==0) ?
array (0,31,60,91,121,152,182,213,244,274,305,335,366) :
array (0,31,59,90,120,151,181,212,243,273,304,334,365);
for ($month=1;$month<12;$month++)
{
if ($days<$months_array[$month]) break;
}

$day=$days-$months_array[$month-1]+1;
//you may gain speed performance by remove som of the below entry's if they are not needed/used
return strtr ($date_syntax, array(
'a' => '',
'A' => '',
'\\d' => 'd',
'd' => ($day>9) ? $day : '0'.$day,
'\\D' => 'D',
'D' => $lang['day_short'][($date-3)%7],
'\\F' => 'F',
'F' => $lang['month_long'][$month-1],
'g' => '',
'G' => '',
'H' => '',
'h' => '',
'i' => '',
'I' => '',
'\\j' => 'j',
'j' => $day,
'\\l' => 'l',
'l' => $lang['day_long'][($date-3)%7],
'\\L' => 'L',
'L' => $leap_year,
'\\m' => 'm',
'm' => ($month>9) ? $month : '0'.$month,
'\\M' => 'M',
'M' => $lang['month_short'][$month-1],
'\\n' => 'n',
'n' => $month,
'O' => '',
's' => '',
'S' => '',
'\\t' => 't',
't' => $months_array[$month]-$months_array[$month-1],
'w' => '',
'\\y' => 'y',
'y' => ($year>29) ? $year-30 : $year+70,
'\\Y' => 'Y',
'Y' => $year+1970,
'\\z' => 'z',
'z' => $days,
'\\W' => '',
'W' => '') );
}
// End add - Birthday MOD