(PHP 4 >= 4.1.0, PHP 5)

cal_days_in_monthВозвращает количество дней в месяце для заданного года и календаря


int cal_days_in_month ( int $calendar , int $month , int $year )

Эта функция возвратит количество дней в месяце month года year для заданного календаря calendar.

Список параметров


Календарь, используемый для вычисления


Месяц в выбранном календаре


Год в выбранном календаре

Возвращаемые значения

Количество дней в конкретном месяце выбранного календаря


Пример #1 Пример использования cal_days_in_month()

cal_days_in_month(CAL_GREGORIAN82003); // 31
echo "Всего $num дней в Августе 2003 года";


Here's a one-line function I just wrote to find the numbers of days in a month that doesn't depend on any other functions.

The reason I made this is because I just found out I forgot to compile PHP with support for calendars, and a class I'm writing for my website's open source section was broken. So rather than recompiling PHP (which I will get around to tomorrow I guess), I just wrote this function which should work just as well, and will always work without the requirement of PHP's calendar extension or any other PHP functions for that matter.

I learned the days of the month using the old knuckle & inbetween knuckle method, so that should explain the mod 7 part. :)

 * days_in_month($month, $year)
 * Returns the number of days in a given month and year, taking into account leap years.
 * $month: numeric month (integers 1-12)
 * $year: numeric year (any integer)
 * Prec: $month is an integer between 1 and 12, inclusive, and $year is an integer.
 * Post: none
// corrected by ben at sparkyb dot net
function days_in_month($month$year)
// calculate number of days in a month
return $month == ? ($year 28 : ($year 100 29 : ($year 400 28 29))) : (($month 1) % 30 31);

David Bindel
2004-01-01 23:06:24
This will work great in future dates but will give the wrong answer for dates before 1550 (approx) when leap year was introduced and the calendar lost a year or two.
Sorry now to be more specific it has been a while sine I had to account for those later dates and had to take that into account but just a heads up for others to watch out.
2004-04-14 13:04:13
# PHP Calendar (version 2.3), written by Keith Devens

function generate_calendar($year$month$days = array(), $day_name_length 3$month_href NULL$first_day 0$pn = array()){
$first_of_month gmmktime(0,0,0,$month,1,$year);

#remember that mktime will automatically correct if invalid dates are entered
    # for instance, mktime(0,0,0,12,32,1997) will be the date for Jan 1, 1998
    # this provides a built in "rounding" feature to generate_calendar()

$day_names = array(); #generate all the day names according to the current locale
for($n=0,$t=(3+$first_day)*86400$n<7$n++,$t+=86400#January 4, 1970 was a Sunday
$day_names[$n] = ucfirst(gmstrftime('%A',$t)); #%A means full textual day name

list($month$year$month_name$weekday) = explode(',',gmstrftime('%m,%Y,%B,%w',$first_of_month));
$weekday = ($weekday $first_day) % 7#adjust for $first_day
$title   htmlentities(ucfirst($month_name)).'&nbsp;'.$year#note that some locales don't capitalize month and day names

    #Begin calendar. Uses a real <caption>. See
@list($p$pl) = each($pn); @list($n$nl) = each($pn); #previous and next links, if applicable
if($p$p '<span class="calendar-prev">'.($pl '<a href="'.htmlspecialchars($pl).'">'.$p.'</a>' $p).'</span>&nbsp;';
$n$n '&nbsp;<span class="calendar-next">'.($nl '<a href="'.htmlspecialchars($nl).'">'.$n.'</a>' $n).'</span>';
$calendar '<table class="calendar">'."\n".
'<caption class="calendar-month">'.$p.($month_href '<a href="'.htmlspecialchars($month_href).'">'.$title.'</a>' $title).$n."</caption>\n<tr>";

$day_name_length){ #if the day names should be shown ($day_name_length > 0)
        #if day_name_length is >3, the full name of the day will be printed
foreach($day_names as $d)
$calendar .= '<th abbr="'.htmlentities($d).'">'.htmlentities($day_name_length substr($d,0,$day_name_length) : $d).'</th>';
$calendar .= "</tr>\n<tr>";

$weekday 0$calendar .= '<td colspan="'.$weekday.'">&nbsp;</td>'#initial 'empty' days
for($day=1,$days_in_month=gmdate('t',$first_of_month); $day<=$days_in_month$day++,$weekday++){
$weekday == 7){
$weekday   0#start a new week
$calendar .= "</tr>\n<tr>";
$days[$day]) and is_array($days[$day])){
$link$classes$content) = $days[$day];
is_null($content))  $content  $day;
$calendar .= '<td'.($classes ' class="'.htmlspecialchars($classes).'">' '>').
$link '<a href="'.htmlspecialchars($link).'">'.$content.'</a>' $content).'</td>';
$calendar .= "<td>$day</td>";
$weekday != 7$calendar .= '<td colspan="'.(7-$weekday).'">&nbsp;</td>'#remaining "empty" days

return $calendar."</tr>\n</table>\n";
#echo generate_calendar($year, $month, $days,$day_name_length,$month_href,$first_day,$pn);
2007-07-19 02:28:28
Remember if you just want the days in the current month, use the date function:
$days = date("t");
2007-12-04 18:55:47
Function  for calculation number of days until birthday:

function daysLeftForBirthday($devabirthdate)
/* input birthday date format -> Y-m-d */
list($y$m$d) = explode('-',$devabirthdate);
$nowdate mktime(000date("m"), date("d"), date("Y"));
$nextbirthday mktime(0,0,0,$m$ddate("Y"));

    if (


2011-03-10 07:44:49
Forgot to compile the calendar plugin in... Wrote a workaround while I waited for it to compile. It only supports the Gregorian calendar.

if (!function_exists('cal_days_in_month'))
if (!
2011-06-14 18:06:13
You can also use the date() function to get the number of days in a month. You can also pass the 2nd param strtotime() and specify a specific date:

2011-11-11 17:51:39
count specific days in a month like how many satureday in a monday or how many mondays in a month

function my_cal_days_in_month($year,$month,$calday="1"){ //0 Sunday, 1 Monday, 2 Tue , 3 Wed , 4. Thu , 5. Fri , 6. Sat
    // calculate total number of occurance in this month
$num cal_days_in_month(CAL_GREGORIAN$month$year); // days in month
$dayofweek date"w"mktime(000$month1$year));     
$calday $dayofweek 
$adddays=$calday $dayofweek;
    else if(
$calday $dayofweek 
$adddays=+ ($calday $dayofweek );
$leavesnum=1+intval($remainingdays 7);

2013-07-29 06:05:42
If you have a DateTime variable you want to find the number of days in the month for, you can simply use $dt->format and the format specifiers 'm' and 'Y' to get the month digit, and year to use with cal_days_in_month eg.

function DaysInMonth($dt) {
    $m =  $dt->format('m');
    $y =  $dt->format('Y');
    $numDays = cal_days_in_month (CAL_GREGORIAN, $m,$y);
    return $numDays;
2013-10-28 07:09:44
To get the number of days in a given month, you just need to pass a timestamp that occurs during that month to the date function.

I've found this is beneficial when I cannot guarantee a particular set of functionality has been compiled into a given PHP installation.

$year "2014"

//equivalent to
//returns 28
2015-03-31 03:10:24
Simplest one for string date like bellow;

      $date = '2017-01-28';
      echo date(' t ', strtotime($date) );

Output : 

strtotime() will convert string date to timestamp and date function will return specified format in this case ' t ' means total number of days in month.
2017-02-08 07:14:25

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