Php add 5 working days to current date excluding weekends (sat-sun) and excluding (multiple) holidays

Question

For delivery of our webshop, we need to calculate 5 working days from the current date in php.

Our working days are from monday to friday and we have several closing day

Answer 1

You can use the "while statement", looping until get enough 5 days. Each time looping get & check one next day is in the holiday list or not.

Here is the the example:

$holidayDates = array(
    '2016-03-26',
    '2016-03-27',
    '2016-03-28',
    '2016-03-29',
    '2016-04-05',
);

$count5WD = 0;
$temp = strtotime("2016-03-25 00:00:00"); //example as today is 2016-03-25
while($count5WD<5){
    $next1WD = strtotime('+1 weekday', $temp);
    $next1WDDate = date('Y-m-d', $next1WD);
    if(!in_array($next1WDDate, $holidayDates)){
        $count5WD++;
    }
    $temp = $next1WD;
}

$next5WD = date("Y-m-d", $temp);

echo $next5WD; //if today is 2016-03-25 then it will return 2016-04-06 as many days between are holidays

Answer 2

Based on Luke's answer:

Difference is that this one generates holidays for every year

<?php
class DateHelper
{
    //change at will
    const HOLIDAY_DATES = [
        ['day' => 25, 'month' => 12],//christimas
        ['day' => 1, 'month' => 1],//new year
        ['day' => 13, 'month' => 4]//easter
    ];
    /**
     * @param int $numBusinessDays
     * @param \DateTimeInterface $date
     * @return \DateTime
     */
    public static function getFutureBusinessDay(int $numBusinessDays, \DateTimeInterface $date)
    {
        $numBusinessDays = min($numBusinessDays, 1000);
        $businessDayCount = 0;
        $currentTimestamp = strtotime($date->format('Y-m-d'));
        $holidayDates = self::getHolidayDates();
        while ($businessDayCount < $numBusinessDays) {
            $next1WD = strtotime('+1 weekday', $currentTimestamp);
            $next1WDDate = date('Y-m-d', $next1WD);
            if (!in_array($next1WDDate, $holidayDates)) {
                $businessDayCount++;
            }
            $currentTimestamp = $next1WD;
        }
        return (new \DateTime())->setTimestamp($currentTimestamp);
    }

    /**
     * @return array
     */
    private static function getHolidayDates()
    {
        $holidays = [];
        foreach (self::HOLIDAY_DATES as $holidayDate) {
            $date = new \DateTime();
            $date->setDate($date->format('Y'), $holidayDate['month'], $holidayDate['day']);
            $holidays[] = $date->format('Y-m-d');
        }
        return $holidays;
    }
}

Answer 3

A function based on Tinh Dang's answer:

function getFutureBusinessDay($num_business_days, $today_ymd = null, $holiday_dates_ymd = []) {
    $num_business_days = min($num_business_days, 1000);
    $business_day_count = 0;
    $current_timestamp = empty($today_ymd) ? time() : strtotime($today_ymd);
    while ($business_day_count < $num_business_days) {
        $next1WD = strtotime('+1 weekday', $current_timestamp);
        $next1WDDate = date('Y-m-d', $next1WD);        
        if (!in_array($next1WDDate, $holiday_dates_ymd)) {
            $business_day_count++;
        }
        $current_timestamp = $next1WD;
    }
    return date('Y-m-d', $current_timestamp);
}

I made it limit the loop to 1000 business days. There could be no limit if desired.