osamc.de/third_wednesday_new.php

<?php
function getNextThirdWednesday() {
    // Set the timezone to Europe/Berlin
    $timezone = new DateTimeZone('Europe/Berlin');
    $today = new DateTime('now', $timezone);
    $month = (int)$today->format('n');
    $year = (int)$today->format('Y');

    // Skip December
    if ($month == 12) {
        $month = 1;
        $year++;
    }

    // Find the third Wednesday of the current month
    $thirdWednesdayThisMonth = new DateTime("third Wednesday of $year-$month", $timezone);

    // Check if today is before or on the third Wednesday
    if ($today <= $thirdWednesdayThisMonth && (int)$thirdWednesdayThisMonth->format('n') == $month) {
        if ($today->format('Y-m-d') == $thirdWednesdayThisMonth->format('Y-m-d')) {
            // Today is the third Wednesday
            return $today->format('d.m.y');
        } else {
            // Today is before the third Wednesday
            return $thirdWednesdayThisMonth->format('d.m.y');
        }
    } else {
        // Move to the next month
        $month++;
        if ($month == 12) {
            $month = 1;
            $year++;
        } elseif ($month > 12) {
            $month = 1;
            $year++;
        }

        // Skip December
        if ($month == 12) {
            $month = 1;
            $year++;
        }

        // Find the third Wednesday of the next month
        $thirdWednesdayNextMonth = new DateTime("third Wednesday of $year-$month", $timezone);
        return $thirdWednesdayNextMonth->format('d.m.y');
    }
}

function getNextElevenThirdWednesdays() {
    // Set the timezone to Europe/Berlin
    $timezone = new DateTimeZone('Europe/Berlin');

    // Get the next third Wednesday from the first function
    $nextThirdWednesdayStr = getNextThirdWednesday();
    $nextThirdWednesdayDate = DateTime::createFromFormat('d.m.y', $nextThirdWednesdayStr, $timezone);

    $dates = array();
    $month = (int)$nextThirdWednesdayDate->format('n');
    $year = (int)$nextThirdWednesdayDate->format('Y');

    // Start from the month after the next third Wednesday date
    $month++;
    if ($month == 12) {
        $month = 1;
        $year++;
    } elseif ($month > 12) {
        $month = 1;
        $year++;
    }

    $count = 0;
    while ($count < 11) {
        // Skip December
        if ($month == 12) {
            $month++;
            if ($month > 12) {
                $month = 1;
                $year++;
            }
            continue;
        }

        // Get the third Wednesday of this month
        $thirdWednesday = new DateTime("third Wednesday of $year-$month", $timezone);

        // Exclude the date from the first function
        if ($thirdWednesday->format('Y-m-d') == $nextThirdWednesdayDate->format('Y-m-d')) {
            $month++;
            if ($month > 12) {
                $month = 1;
                $year++;
            }
            continue;
        }

        // Collect the date in DD.MM format
        $dates[] = $thirdWednesday->format('d.m');
        $count++;

        // Increment month
        $month++;
        if ($month == 12) {
            $month++;
        }
        if ($month > 12) {
            $month = 1;
            $year++;
        }
    }

    // Return the dates as a string separated by spaces
    return implode(' ', $dates);
}

// Execute the usage part only if the script is run directly
if (__FILE__ == realpath($_SERVER['SCRIPT_FILENAME'])) {
    echo "Next third Wednesday (excluding December): " . getNextThirdWednesday() . "\n";
    echo "Next 11 third Wednesdays (excluding December): " . getNextElevenThirdWednesdays() ."\n";
}
?>