function isLeapYear($year){
// 1 januari 1900 is monday, use century-check only when 1 januari 1900 is monday;
if(($year % 100 == 0) and ($year % 400 != 0)) return(0);
if($year % 4 == 0) return(1);
return(0);
}
function getWeekDay($year, $month, $day){
$dcm = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
// 1 januari 1900 is sunday;
$gwdYear = 1899;
$gwdMonth = 12;
$gwdDay = 31;
// 1 januari 1900 is monday;
$gwdYear = 1899;
$gwdMonth = 12;
$gwdDay = 30;
$diffDays = 0;
$diffDays = $diffDays + $day;
for($m = (($year * 12) + $month) - 1; $m > (($gwdYear * 12) + $gwdMonth); $m--) {
$y = (($m - 1) / 12);
$i = ($m % 12) + 12;
if(isLeapYear($y) == 1) {
$dcm[1] = 29; $dcm[13] = 29;
}else{
$dcm[1] = 28; $dcm[13] = 28;
}
$diffDays = $diffDays + $dcm[$i-1];
}
$diffDays = $diffDays + ($dcm[$gwdMonth - 1] - $gwdDay);
$weekDay = ($diffDays % 7) - 2;
if($weekDay < 0) $weekDay = $weekDay + 7;
return($weekDay + 1);
}
function getDateNumber($year, $month, $day){
$diffDays = 0;
for($y = 0; $y < $year; $y++) {
$diffDays = $diffDays + 365;
if(isLeapYear($y) == 1) $diffDays = $diffDays + 1;
}
for($m = 1; $m < $month; $m++) {
if($m == 1 or $m == 3 or $m == 5 or $m == 7 or $m == 8 or $m == 10 or $m == 12) {
$diffDays = $diffDays + 31;
}else{
$diffDays = $diffDays + 30;
}
if(isLeapYear($year) == 1 and $m == 2) $diffDays = $diffDays - 1;
if(isLeapYear($year) == 0 and $m == 2) $diffDays = $diffDays - 2;
}
$diffDays = $diffDays + $day;
return($diffDays);
}
function CalculateIsoWeekday($year, $month, $day){
// This function converts the weekday-numbers from the
// standard function to an offset acc. to the ISO version
// monday -> 0, ... , sunday -> 6
$n = getWeekday($year, $month, $day);
return($n - 1);
}
function getWeekNumber($year, $month, $day){
// The year value is preset with that of the input date
$YearInQuestion = $year;
// Calculate offset to monday from the input date
$InputDateOffset = CalculateIsoWeekday($year, $month, $day);
// Calculate offsets for the first/last day of the year
$January1Offset = CalculateIsoWeekday($YearInQuestion, 1, 1);
$December31Offset = CalculateIsoWeekday($YearInQuestion, 12, 31);
// If the input date is before the 4th of January and the year starts with
// a friday, saturday or sunday, the week belongs to the previous year
// if the entered date is not a monday or tuesday
if($month == 1 and $day < 4 and $January1Offset > 3 and $InputDateOffset > 1) {
$YearInQuestion = $YearInQuestion - 1;
}
// If the input date is after the 28th of December and the year ends with
// a monday, tuesday or wednesday, then the week belongs to the following year
// if the entered date is not a saturday or sunday
if ($month == 12 and $day > 28 and $December31Offset < 3 and $InputDateOffset < 5) {
$YearInQuestion = $YearInQuestion + 1;
}
// The 4th of January defines week #1
$January4 = getDatenumber($YearInQuestion, 1, 4);
// Offset to the monday of week #1
$FirstMondayOfYear = getDatenumber($YearInQuestion, 1, 4 - CalculateIsoWeekday($YearInQuestion, 1, 4));
// The time range between the monday of week #1 and the monday
// of the week in question is divided by 7, plus 1 for the first week
$weeknum = (getDateNumber($year, $month, $day) - $InputDateOffset - $FirstMondayOfYear ) / 7 + 1;
return($weeknum);
}
function phpdate($year, $month, $day, $format){
if($format == "mmmm") {
if($month == 1) return("january");
if($month == 2) return("february");
if($month == 3) return("march");
if($month == 4) return("april");
if($month == 5) return("may");
if($month == 6) return("june");
if($month == 7) return("july");
if($month == 8) return("august");
if($month == 9) return("september");
if($month == 10) return("october");
if($month == 11) return("november");
if($month == 12) return("december");
}
if($format == "yyyy") {
return($year);
}
}
function getCalendar() {
if($_GET["year"] == "") $year = date("Y"); else $year = $_GET["year"];
if($_GET["month"] == "") $month = date("n"); else $month = $_GET["month"];
if($_GET["day"] == "") $day = date("d"); else $day = $_GET["day"];
$dow = array("mon", "tue", "wed", "thu", "fri", "sat", "sun");
if(isLeapYear($year) == 1) {
$dom = array(31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
}else{
$dom = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
}
$calendar = "";
$calendar .= "";
$calendar .= "";
$calendar .= "C A L E N D A R";
$calendar .= " ";
$calendar .= " ";
$calendar .= "";
$calendar .= "";
$m = $month;
$y = $year - 1;
if($year != 1900) $calendar .= "7";
if($month == 1) {
$m = 12;
$y = $year - 1;
}else{
$m = $month - 1;
$y = $year;
}
if(!($year == 1900 and $month == 1)) $calendar .= "3";
$calendar .= "
$calendar .= "";
$calendar .= phpdate($year, $month, $day, "mmmm", $lang) . " " . phpdate($year, $month, $day, "yyyy", $lang);
$calendar .= "
$calendar .= "";
if($month == 12){
$m = 1;
$y = $year + 1;
}else{
$m = $month + 1;
$y = $year;
}
$calendar .= "4";
$m = $month;
$y = $year + 1;
$calendar .= "8";
$calendar .= "
$calendar .= " ";
$dayno = 2 - getWeekDay($year, $month, 1);
$daymin = 1;
$daymax = $dom[$month - 1];
if($month == 1) {$daymaxl = 12;} else {$daymaxl = $month - 1;}
for($row = 1; $row <= 7; $row++) {
for($col = 1; $col <= 8; $col++) {
$calendar .= "";
// print weekday headers
if($row == 1 and $col != 1) {
$calendar .= "";
$calendar .= $dow[$col-1-1];
$calendar .= "";
}
// print weeknumbers
if($row != 1 and $col == 1) {
$calendar .= "";
if($dayno < $daymin){
$y = $year;
if($month == 1) $m = 12;
if($month != 1) $m = $month - 1;
if($month == 1) $y = $year - 1;
$d = ($dom[$daymaxl - 1]) + $dayno;
$calendar .= sprintf("%02d",getWeekNumber($y, $m, $d));
}else{
if($dayno > $daymax){
$y = $year;
if($month == 12) $m = 1;
if($month != 12) $m = $month + 1;
if($month == 12) $y = $year + 1;
$d = $dayno - $daymax;
$calendar .= sprintf("%02d",getWeekNumber($y, $m, $d));
}else{
$calendar .= sprintf("%02d",getWeekNumber($year, $month, $dayno));
}
}
$calendar .= "";
}
// print day numbers
if($row > 1 and $col != 1){
if($dayno < $daymin){
$calendar .= "";
$calendar .= ($dom[$daymaxl - 1]) + $dayno;
$calendar .= "";
}else{
if($dayno > $daymax){
$calendar .= "";
$calendar .= $dayno - $daymax;
$calendar .= "";
}else{
$calendar .= $dayno;
}
}
$dayno = $dayno + 1;
}
$calendar .= "
}
$calendar .= "";
}
$calendar .= " ";
$calendar .= "
";
return($calendar);
}
?>
getCalendar()