diff --git a/index.html b/index.php
similarity index 92%
rename from index.html
rename to index.php
index 424d506..7f0f260 100644
--- a/index.html
+++ b/index.php
@@ -1,3 +1,9 @@
+<?php
+include "third_wednesday.php";
+$nextDate = nextThirdWednesday();
+$followingDates = listNextElevenThirdWendesdays();
+?>
+
 <!doctype html>
 <html lang="en">
 <head>
@@ -175,21 +181,10 @@
 
                                 <div class="Information">
 
-                                    <h4>Termine<span><a href="https://plan.osamc.de">18.10.2023</a> 19:00 Uhr </span></h4>
+                                    <h4>Termine<span><a href="https://plan.osamc.de"><?php echo $nextDate; ?></a> 19:00 Uhr </span></h4>
 
                                     <p>Jeder Dritte Mittwoch im Monat (außer Dezember):<br>
-                                    15.11.
-                                    17.1.
-                                    21.2.
-                                    20.3.
-                                    17.4.
-                                    15.5.
-                                    19.6.
-                                    17.7.
-                                    21.8.
-                                    18.9.
-                                    16.10.
-                                    20.11.
+                                    <?php echo $followingDates; ?>
                                     </p>
 
                                 </div>
@@ -231,7 +226,7 @@
 
                         <div class="Form">
 
-                            <h3>Nächstes Treffen: <span>18.10.2023</span></h3>
+                            <h3>Nächstes Treffen: <span><?php echo $nextDate; ?></span></h3>
                             <form method="post" action="#">
                                 <fieldset disabled>
 
diff --git a/third_wednesday.php b/third_wednesday.php
new file mode 100644
index 0000000..b835df8
--- /dev/null
+++ b/third_wednesday.php
@@ -0,0 +1,60 @@
+<?php
+
+function nextThirdWednesday() {
+    // Set the default time zone to your desired one
+    date_default_timezone_set('Europe/Berlin');
+
+    $date = new DateTime( 'third wednesday of this month, 17:00' );
+    if( date_create()->diff( $date )->invert )
+    {
+        $date = new DateTime( 'third wednesday of next month, 17:00' );
+    }
+
+
+    if ($date->format('m') == '12') {
+        // If it's December, advance to January of the following year
+        $date->modify('third wednesday of January next year');
+        $date->modify('-1 day'); // not sure why.
+    }
+
+
+    $nextThirdWednesdayFormatted = $date->format('d.m.y');
+    return $nextThirdWednesdayFormatted;
+}
+
+function listNextElevenThirdWendesdays() {
+    date_default_timezone_set('Europe/Berlin');
+
+    //Start with the actual next meeting date, that is already calculated by another function already.
+    $date = new DateTime( 'third wednesday of this month, 17:00' );
+    if( date_create()->diff( $date )->invert )
+    {
+        $date = new DateTime( 'third wednesday of next month, 17:00' );
+    }
+
+    if ($date->format('m') == '12') {
+        // If it's December, advance to January of the following year
+        $date->modify('third wednesday of January next year');
+        $date->modify('-1 day'); // not sure why.
+    }
+
+
+    $result = "";
+
+    for ($i=0; $i < 11; $i++) {
+
+        $date->modify('third wednesday of next month');
+        //Again:
+        if ($date->format('m') == '12') {
+            // If it's December, advance to January of the following year
+            $date->modify('third wednesday of January next year');
+            $date->modify('-1 day'); // not sure why.
+        }
+
+        $result = $result . " " . $date->format('d.m');
+    }
+
+    return $result;
+}
+
+?>
