PHP Code:
class lastBusinessDay {
private $today;
public function __construct($today) {
//$today = "2011-10-15";
// IF NO DATE WAS SET, GET TODAYS DATE
if ($today == null) {
$this->today = date("Y-m-d");//"2011-01-25";
} else {
$this->today = $today;
}
//return $this->today;
//return $this->lastBusinessDay($this->today);
//return $this->getLastDay($this->today);
}
public function getLastDay() {
// GET THE LAST DAY OF THE CURRENT MONTH BASED ON TODAYS DATE
$dayArray = $this->findDay($this->today);
//print_r($dayArray);
// GET THE VARIABLES FROM THE LAST DAY OF THE MONTH ARRAY THAT WAS RETURNED
$day = $dayArray[0];
$nDay = $dayArray[1];
$yr = $dayArray[2];
$month = $dayArray[3];
$nMonth = $dayArray[4];
// LIST OF HOLIDAY DATES
$newYears = $this->format_date($yr, 1, 1); // NEW YEAR'S DAY
$newYearsO = $this->observed_day($yr, 1, 1); // NEW YEAR'S DAY OBSERVED
$mlk = $this->get_holiday($yr, 1, 1, 3); // MARTIN LUTHER KING DAY
$val = $this->format_date($yr, 2, 14); // VALENTINE'S DAY
$pres = $this->get_holiday($yr, 2, 1, 3); // PRESEDENT'S DAY
$stPatricks = $this->format_date($yr, 3, 17); // ST. PATRICK'S DAY
$easter = $this->calculate_easter($yr); // EASTER SUNDAY
$cdMayo = $this->format_date($yr, 5, 5); // CINCO DE MAYO
$memorial = $this->get_holiday($yr, 5, 1); // MEMORIAL DAY
$independence = $this->format_date($yr, 7, 4); // INDEPENDENCE DAY
$independenceO = $this->observed_day($yr, 7, 4); // INDEPENDENCE DAY OBSERVED
$labor = $this->get_holiday($yr, 9, 1, 1); // LABOR DAY
$columbus = $this->get_holiday($yr, 10, 1, 2); // COLUMBUS DAY
$halloween = $this->format_date($yr, 10, 31); // HALLOWEEN
$veterans = $this->format_date($yr, 11, 11); // VETERAN'S DAY
$thanksgiving = $this->get_holiday($yr, 11, 4, 4); // THANKSGIVING
$christmas = $this->format_date($yr, 12, 25); // CHRISTMAS
// OUR OBSERVED HOLIDAYS FOR FREELIFE
$holidays = array(
$newYearsO,
$memorial,
$independenceO,
$labor,
$thanksgiving,
$christmas
);
// GET THE CURRENT LAST DAY BEING RETURNED
$lastDay = "{$yr}-{$nMonth}-{$nDay}";
// IF THE LAST DAY OF THE MONTH IS A HOLIDAY, LETS TAKE ONE DAY OFF
if ( in_array($lastDay, $holidays) ) {
$nMonth = $nMonth - 1;
$nDay = $nDay - 1;
if ($day == 'sun') {
$day = 'sat';
} elseif ($day == 'mon') {
$day = 'sun';
} elseif ($day == 'tue') {
$day = 'mon';
} elseif ($day == 'wed') {
$day = 'tue';
} elseif ($day == 'thu') {
$day = 'wed';
} elseif ($day == 'fri') {
$day = 'thu';
} elseif ($day == 'sat') {
$day = 'fri';
}
}
// NOW WE WILL SEE IF THE LAST DAY IS ON A WEEKEND
// IF IS IT, WE WILL RESET THE LAST WORKABLE DAY TO FRIDAY
if ($day == 'sat') {
$nDay = $nDay - 1;
} elseif ($day == 'sun') {
$nDay = $nDay - 2;
} elseif ($day == 'mon') {
$nDay = $nDay - 2;
} else {
$nDay = $nDay;
}
$dayBeforeLast = "{$yr}-{$nMonth}-{$nDay}";
$start = $dayBeforeLast;
$end = $lastDay;
$dateDiff = $this->date_diff($start,$end);
//print_r($dateDiff);
$lastWorkDay = $nDay;
$lastMonthDay = $dayArray[1];
$datesArray = array();
$datesArray["last_day"] = $lastDay;
$datesArray["last_busi"] = $dayBeforeLast;
if ($lastMonthDay != $lastWorkDay) {
for($i=$lastWorkDay; $i<=$lastMonthDay; $i++) {
if ($lastWorkDay != $i && $lastMonthDay != $i) {
$datesArray["id{$i}"] = "{$yr}-{$nMonth}-{$i}";
}
}
}
//print_r($datesArray);
// RETURN WHAT THE LAST WORK DAY HAS BEEN CALCULATED TO
//return $day . ', ' . $month . ' ' . $nDay . ', ' . $yr;
return $datesArray;
}
// FORMAT THE RETURNED DATE
private function format_date($year, $month, $day) {
// PAD SINGLE DIGIT MONTH/DAY WITH A LEADING ZERO FOR CONSITENCY
// AND FORMAT DATE AS DESIRED: YYYY-MM-DD BY DEFAULT
if (strlen($month) == 1) {
$month = "0". $month;
}
if (strlen($day) == 1) {
$day = "0". $day;
}
$today = $year ."-". $month ."-". $day;
return $today;
}
// FIND THE LAST DAY OF THE MONTH FROM ANY GIVEN DATE
private function findDay($today=null) {
list($yr,$mn,$dt) = explode('-',$today); // separate year, month and date
$timeStamp = mktime(0,0,0,$mn,1,$yr); //Create time stamp of the first day from the give date.
list($y,$m,$t) = explode('-',date('Y-m-t',$timeStamp)); //Find the last date of the month and separating it
$lastDayTimeStamp = mktime(0,0,0,$m,$t,$y);//create time stamp of the last date of the give month
$day = strtolower(date('D',$lastDayTimeStamp)); //date('D',$lastDayTimeStamp);// Find last day of the month
$nDay = date('d',$lastDayTimeStamp); // Find last day of the month
$month = date('F',$lastDayTimeStamp); // Find last day of the month
$nMonth = date('m',$lastDayTimeStamp); // Find last day of the month
return array($day,$nDay,$yr,$month,$nMonth);
}
// IF $WEEK IS NOT PASSED, THEN CHECK FOR LAST WEEK OF MONTH
private function get_holiday($year, $month, $day_of_week, $week="") {
if ( (($week != "") && (($week > 5) || ($week < 1))) || ($day_of_week > 6) || ($day_of_week < 0) ) {
// $day_of_week must be between 0 and 6 (Sun=0, ... Sat=6); $week must be between 1 and 5
return FALSE;
} else {
if (!$week || ($week == "")) {
$lastday = date("t", mktime(0,0,0,$month,1,$year));
$temp = (date("w",mktime(0,0,0,$month,$lastday,$year)) - $day_of_week) % 7;
} else {
$temp = ($day_of_week - date("w",mktime(0,0,0,$month,1,$year))) % 7;
}
if ($temp < 0) {
$temp += 7;
}
if (!$week || ($week == "")) {
$day = $lastday - $temp;
} else {
$day = (7 * $week) - 6 + $temp;
}
return $this->format_date($year, $month, $day);
}
}
private function observed_day($year, $month, $day) {
// sat -> fri & sun -> mon, any exceptions?
//
// should check $lastday for bumping forward and $firstday for bumping back,
// although New Year's & Easter look to be the only holidays that potentially
// move to a different month, and both are accounted for.
$dow = date("w", mktime(0, 0, 0, $month, $day, $year));
if ($dow == 0) {
$dow = $day + 1;
} elseif ($dow == 6) {
if (($month == 1) && ($day == 1)) { // New Year's on a Saturday
$year--;
$month = 12;
$dow = 31;
} else {
$dow = $day - 1;
}
} else {
$dow = $day;
}
return $this->format_date($year, $month, $dow);
}
private function calculate_easter($y) {
// In the text below, 'intval($var1/$var2)' represents an integer division neglecting
// the remainder, while % is division keeping only the remainder. So 30/7=4, and 30%7=2
//
// This algorithm is from Practical Astronomy With Your Calculator
$a = $y%19;
$b = intval($y/100);
$c = $y%100;
$d = intval($b/4);
$e = $b%4;
$f = intval(($b+8)/25);
$g = intval(($b-$f+1)/3);
$h = (19*$a+$b-$d-$g+15)%30;
$i = intval($c/4);
$k = $c%4;
$l = (32+2*$e+2*$i-$h-$k)%7;
$m = intval(($a+11*$h+22*$l)/451);
$p = ($h+$l-7*$m+114)%31;
$EasterMonth = intval(($h+$l-7*$m+114)/31); // [3 = March, 4 = April]
$EasterDay = $p+1; // (day in Easter Month)
return $this->format_date($y, $EasterMonth, $EasterDay);
}
// THIS FUNCTION USES THE NATIVE FUNCTIONS OF PHP TO CALCULATE THE DIFFERENCE BETWEEN TWO TIMESTAMPS
private function date_diff($start,$end = false) {
//echo $start . ' / ' . $end . '<br/>';
$diff = abs(strtotime($end) - strtotime($start));
$years = floor($diff / (365*60*60*24));
$months = floor(($diff - $years * 365*60*60*24) / (30*60*60*24));
$days = floor(($diff - $years * 365*60*60*24 - $months*30*60*60*24)/ (60*60*24));
//printf("%d years, %d months, %d days\n", $years, $months, $days);
return array("year"=>"{$years}", "month"=>"{$months}", "day"=>"{$days}", "start"=>"{$start}", "end"=>"{$end}");
}
} // END CLASS LASTBUSINESSDAY
this may be something that could be useful to others for certain things, so, feel free to use the object or parts of it for whatever. 
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