vendor/mtdowling/cron-expression/src/Cron/DayOfWeekField.php

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<?php

namespace Cron;

use DateTime;
use InvalidArgumentException;


/**
 * Day of week field.  Allows: * / , - ? L #
 *
 * Days of the week can be represented as a number 0-7 (0|7 = Sunday)
 * or as a three letter string: SUN, MON, TUE, WED, THU, FRI, SAT.
 *
 * 'L' stands for "last". It allows you to specify constructs such as
 * "the last Friday" of a given month.
 *
 * '#' is allowed for the day-of-week field, and must be followed by a
 * number between one and five. It allows you to specify constructs such as
 * "the second Friday" of a given month.
 */
class DayOfWeekField extends AbstractField
{
    public function isSatisfiedBy(DateTime $date, $value)
    {
        if ($value == '?') {
            return true;
        }

        // Convert text day of the week values to integers
        $value = $this->convertLiterals($value);

        $currentYear = $date->format('Y');
        $currentMonth = $date->format('m');
        $lastDayOfMonth = $date->format('t');

        // Find out if this is the last specific weekday of the month
        if (strpos($value, 'L')) {
            $weekday = str_replace('7', '0', substr($value, 0, strpos($value, 'L')));
            $tdate = clone $date;
            $tdate->setDate($currentYear, $currentMonth, $lastDayOfMonth);
            while ($tdate->format('w') != $weekday) {
                $tdateClone = new DateTime();
                $tdate = $tdateClone
                    ->setTimezone($tdate->getTimezone())
                    ->setDate($currentYear, $currentMonth, --$lastDayOfMonth);
            }

            return $date->format('j') == $lastDayOfMonth;
        }

        // Handle # hash tokens
        if (strpos($value, '#')) {
            list($weekday, $nth) = explode('#', $value);

            // 0 and 7 are both Sunday, however 7 matches date('N') format ISO-8601
            if ($weekday === '0') {
                $weekday = 7;
            }