diff --git a/gen_vor.php b/gen_vor.php
new file mode 100644
index 0000000..4e5a7e0
--- /dev/null
+++ b/gen_vor.php
@@ -0,0 +1,56 @@
+<?php
+// read vor.txt and generate vor.md, inserting dates if missing
+// Helper function for next Tuesday calculation depending on PHP version
+function getTuesday($ts) {
+    // This is for PHP >= 8.1 as the old strftime will be deprecated by then, so use datefmt_format_object if we are running on PHP beyond version 7
+    if (intval(explode(".", phpversion())[0]) >= 7) {
+        $date_time = new DateTime();
+        $date_time->setTimestamp(strtotime('fourth tuesday of this month', $ts));
+        $tuesday = datefmt_format_object($date_time, 'cccc, d.M.yyyy ', 'de_DE.utf8');
+    } else {
+        $tuesday = strftime('%A, %d.%m.%Y ', strtotime('fourth tuesday of this month', $ts));
+    }
+    return $tuesday;
+}
+
+date_default_timezone_set("CET");
+setlocale(LC_TIME, 'de_DE.utf8');
+$file_txt = 'vor.txt';
+$file_md = 'vor.md';
+$fil = file($file_txt, FILE_IGNORE_NEW_LINES);
+// Insert header
+$arr = ['| | |  |', '|:------|:------|:------|'];
+$ts=(new DateTime('first day of this month'))->getTimeStamp();
+$tues_ts = strtotime('fourth tuesday of this month', $ts);
+
+// Are we past the fourth Tuesday of this month? 
+if ((new DateTime())->getTimeStamp() >= $tues_ts) {
+    $ts = strtotime('+1 month', $ts);
+} 
+
+foreach ($fil as $line) {
+    // Skip empty lines
+    if (strlen($line)) {
+        // Remove empty fields too
+        $fields = array_filter(explode('|', $line));
+        // Get next Tuesday independent of PHP version
+        $tuesday = getTuesday($ts);
+        if (count($fields) == 2) {
+            // Date missing, insert
+            array_unshift($fields, $tuesday);
+        }
+        $ts = strtotime('+1 month', $ts);
+        $li = implode('|', $fields);
+        // Insert leading and trailing spaces if required
+        if ($li[0] != ' ') {
+            $li = ' ' . $li;
+        }
+        if (substr($li, -1) != ' ') {
+            $li = $li . ' ';
+        }
+        array_push($arr, '|' . $li . '|');    
+    }
+}
+file_put_contents($file_md, implode(PHP_EOL, $arr) . PHP_EOL);
+?>
+