Get number of weekdays in a given month

Question

I want to calculate the number of weekdays days in a give month and year. Weekdays means monday to friday. How do i do it ?

Answer 1

Find the last day and the weekday for the given month
then do a simple while loop like :-

$dates = explode(',', date('t,N', strtotime('2013-11-01')));
$day = $dates[1]; 
$tot = $dates[0]; 
$cnt = 0;
while ($tot>1)
{   
    if ($day < 6)
    {   
        $cnt++;
    }   
    if ($day == 1)
    {   
        $day = 7;
    }   
    else
    {   
        $day--;
    }   
    $tot--;
}

$cnt = total of weekday (Monday to Friday) for a given month

Answer 2

try this one

function getWeekdays($m, $y = NULL){
    $arrDtext = array('Mon', 'Tue', 'Wed', 'Thu', 'Fri');

    if(is_null($y) || (!is_null($y) && $y == ''))
        $y = date('Y');

    $d = 1;
    $timestamp = mktime(0,0,0,$m,$d,$y);
    $lastDate = date('t', $timestamp);
    $workingDays = 0;
    for($i=$d; $i<=$lastDate; $i++){
        if(in_array(date('D', mktime(0,0,0,$m,$i,$y)), $arrDtext)){
            $workingDays++;
        }
    }
    return $workingDays;
}

Answer 3

function workingDays($m,$y) {
    $days = cal_days_in_month(CAL_GREGORIAN, $m, $y);
    $workig_days = 0;
    $days_rest = array(5,6); //friday,saturday
    for ( $d=1 ; $d < $days+1 ; $d++ ) {
        if ( !in_array(date("w",strtotime("{$d}-{$m}-{$y}")),$days_rest)  ) {
            $workig_days++;
        }
    }
    return $workig_days;
}

Answer 4

These functions work Without Loops.

The functions calculate the number of weekdays using:

• day-number of first monday in month
• number of days in month

// main functions 
// weekdays in month of year
function calculateNumberOfWeekDaysAtDate($month, $year)
{
    // I'm sorry, I don't know the right format for the $month and $year, I hope this is right.
    // PLEASE CORRECT IF WRONG
    $firstMondayInCurrentMonth = (int) date("j", strtotime("first monday of 01-$month-$year")); //get first monday in month for calculations
    $numberOfDaysOfCurrentMonth = (int) date("t", strtotime("01-$month-$year")); // number of days in month

    return calculateNumberOfWeekDaysFromFirstMondayAndNumberOfMonthDays($firstMondayInCurrentMonth, $numberOfDaysOfCurrentMonth);
}

// week days in current month
function calculateNumberOfWeekDaysInCurrentMonth()
{
    $firstMondayInCurrentMonth = (int) date("j", strtotime("first monday of this month")); //get first monday in month for calculations
    $numberOfDaysOfCurrentMonth = (int) date("t"); // number of days in this month

    return calculateNumberOfWeekDaysFromFirstMondayAndNumberOfMonthDays($firstMondayInCurrentMonth, $numberOfDaysOfCurrentMonth);
}

// helper functions
function calculateNumberOfWeekDaysFromFirstMondayAndNumberOfMonthDays($firstMondayInCurrentMonth, $numberOfDaysOfCurrentMonth)
{
    return $numberOfWeekDays = (($start = ($firstMondayInCurrentMonth - 3)) < 0 ? 0 : $start) + floor(($numberOfDaysOfCurrentMonth - ($firstMondayInCurrentMonth - 1)) / 7) * 5 + (($rest = (($numberOfDaysOfCurrentMonth - ($firstMondayInCurrentMonth - 1)) % 7)) <= 5 ? $rest : 5);
}

Answer 5

DateObject method:

function getWorkingDays(DateTime $date) {
    $month = clone $date;
    $month->modify('last day of this month');
    $workingDays = 0;
    for ($i = $month->format('t'); $i > 28; --$i) {
        if ($month->format('N') < 6) {
            ++$workingDays;
        }
        $month->modify('-1 day');
    }

    return 20 + $workingDays;
}

Answer 6

I've come up with a non-loop function. Much better in terms of performance. It might seem messy but it just needs to ask PHP the first day's weekday and the month's number days: the rest are arithmetical operations based on logic.

function countWorkDays($year, $month)
{
    $workingWeekdays   = 5;
    $firstDayTimestamp = mktime(0, 0, 0, $month, 1, $year);
    $firstDayWeekDay   = (int)date("N", $firstDayTimestamp); //1: monday, 7: saturday
    $upToDay           = (int)date("t", $firstDayTimestamp);

    $firstMonday = 1 === $firstDayWeekDay ? 1 : 9 - $firstDayWeekDay;
    $wholeWeeks  = $firstMonday < $upToDay ? (int)floor(($upToDay - $firstMonday + 1) / 7) : 0;
    $extraDays   = ($upToDay - $firstMonday + 1) % 7;

    $initialWorkdays      = $firstMonday > 1 && $firstDayWeekDay <= $workingWeekdays ? $workingWeekdays - $firstDayWeekDay + 1 : 0;
    $workdaysInWholeWeeks = $wholeWeeks * $workingWeekdays;
    $extraWorkdays        = $extraDays <= $workingWeekdays ? $extraDays : $workingWeekdays;

    return $initialWorkdays + $workdaysInWholeWeeks + $extraWorkdays;
}