DayOfMonthField.php

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<?php

class DayOfMonthField extends AbstractField
{
    private static function getNearestWeekday($currentYear, $currentMonth, $targetDay)
    {
        $tday = str_pad($targetDay, 2, '0', STR_PAD_LEFT);
        $target = DateTime::createFromFormat('Y-m-d', "$currentYear-$currentMonth-$tday");
        $currentWeekday = (int) $target->format('N');

        if ($currentWeekday < 6) {
            return $target;
        }

        $lastDayOfMonth = $target->format('t');

        foreach (array(-1, 1, -2, 2) as $i) {
            $adjusted = $targetDay + $i;
            if ($adjusted > 0 && $adjusted <= $lastDayOfMonth) {
                $target->setDate($currentYear, $currentMonth, $adjusted);
                if ($target->format('N') < 6 && $target->format('m') == $currentMonth) {
                    return $target;
                }
            }
        }
    }

    public function isSatisfiedBy(DateTime $date, $value)
    {
        // ? states that the field value is to be skipped
        if ($value == '?') {
            return true;
        }

        $fieldValue = $date->format('d');

        // Check to see if this is the last day of the month
        if ($value == 'L') {
            return $fieldValue == $date->format('t');
        }

        // Check to see if this is the nearest weekday to a particular value
        if (strpos($value, 'W')) {
            // Parse the target day
            $targetDay = substr($value, 0, strpos($value, 'W'));
            // Find out if the current day is the nearest day of the week
            return $date->format('j') == self::getNearestWeekday($date->format('Y'), $date->format('m'), $targetDay)->format('j');
        }

        return $this->isSatisfied($date->format('d'), $value);
    }

    public function increment(DateTime $date, $invert = false)
    {
        if ($invert) {
            $date->sub(new DateInterval('P1D'));
            $date->setTime(23, 59, 0);
        } else {
            $date->add(new DateInterval('P1D'));
            $date->setTime(0, 0, 0);
        }

        return $this;
    }

    public function validate($value)
    {
        return (bool) preg_match('/[\*,\/\-\?LW0-9A-Za-z]+/', $value);
    }
}