diff --git a/firmware/firmware.ino b/firmware/firmware.ino
index 55169d1..45ea629 100644
--- a/firmware/firmware.ino
+++ b/firmware/firmware.ino
@@ -198,7 +198,8 @@ void read_eeprom_config() {
 
 //********************************//
 
-void setup() {
+void setup()
+{
   EEPROM.begin(256);
 
   Serial.begin(SERIAL_BAUD_RATE);
@@ -245,7 +246,8 @@ void setup() {
 
 //********************************//
 
-void loop() {
+void loop()
+{
   server.handleClient();
   lightEngine();
 
@@ -332,7 +334,7 @@ void init_webserver() {
     DynamicJsonDocument root(1024);
     root["on"] = light_state[light];
     root["bri"] = bri[light];
-    root["bricur"] = (int)current_bri[light];
+    root["curbri"] = (int)current_bri[light];
     String output;
     serializeJson(root, output);
     server.send(200, "text/plain", output);
@@ -532,7 +534,7 @@ void init_webserver() {
 
     http_content += "<form class=\"pure-form pure-form-aligned\" action=\"/\" method=\"post\">";
     http_content += "<script>"
-                    "let timeoutId;"
+                    "let timeoutId;" // slider value change submit to server
                     "function sendSliderValue(x) {"
                     "x = x - 1;"
                     "clearTimeout(timeoutId);"
@@ -664,6 +666,7 @@ void init_webserver() {
     http_content += "\" href=\"/?dip=false\">OFF</a>";
     http_content += "</div>";
 
+    // ip config
     if (dip == 0) {
       http_content += "<div class=\"pure-control-group\">";
       http_content += "<label for=\"ip\">IP</label>";
@@ -685,9 +688,9 @@ void init_webserver() {
     http_content += "</div>";
 
     http_content += "<script>"
-                    "function loadData() {"
+                    "function loadData() {" // load tc data and generate graph
                     "$.getJSON('/tc_data_blocks', function(data) {"
-                    "var currenttime = '';"
+                    "var currenttime = [];"
                     "var time = [];"
                     "var channel1 = [];"
                     "var channel2 = [];"
@@ -700,7 +703,41 @@ void init_webserver() {
                     "channel3.push(data['tcdata'][i]['ch3']);"
                     "channel4.push(data['tcdata'][i]['ch4']);"
                     "}"
-                    "currenttime=data['currenttime'];"
+                    "currenttime.push(data['currenttime']['hour']);"
+                    "currenttime.push(data['currenttime']['min']);"
+                    //"console.log(currenttime);"
+
+                    // index suche für die vertikale linie
+                    "var currentTimeStr = currenttime[0] + ':' + (currenttime[1] < 10 ? '0' : '') + currenttime[1];"
+                    "var index = time.indexOf(currentTimeStr);"
+                    "if (index === -1) {"
+                    "var lowerIndex = -1;"
+                    "var upperIndex = -1;"
+                    "for (var i = 0; i < time.length - 1; i++) {"
+                    "if (time[i] <= currentTimeStr && currentTimeStr <= time[i+1]) {"
+                    "lowerIndex = i;"
+                    "upperIndex = i + 1;"
+                    "break;"
+                    "}"
+                    "}"
+                    "if (lowerIndex === -1 || upperIndex === -1) {"
+                    "console.log(\"Error: Current time not found in time array and not between two elements in time array.\");"
+                    "return;"
+                    "}"
+                    "var lowerTime = time[lowerIndex].split(\":\");"
+                    "var upperTime = time[upperIndex].split(\":\");"
+                    "var timeDiff = (currenttime[0] - lowerTime[0]) + ((currenttime[1] - lowerTime[1]) / 60);"
+                    "var indexFloat = lowerIndex + timeDiff / ((upperTime[0] - lowerTime[0]) + ((upperTime[1] - lowerTime[1]) / 60));"
+                    //"console.log(\"Index (float): \" + indexFloat);"
+                    "} else {"
+                    //"console.log(\"Index (integer): \" + index);"
+                    //"console.log(\"Index (float): \" + index);"
+                    "}"
+                    "if (indexFloat > index) {"
+                    "index = indexFloat;"
+                    "}"
+                    //"console.log(\">>>\" + index);"
+
                     "var trace1 = {"
                     "x: time,"
                     "y: channel1,"
@@ -741,9 +778,9 @@ void init_webserver() {
                     "},"
                     "shapes: [{"
                     "type: 'line',"
-                    "x0: currenttime,"
+                    "x0: index,"
                     "y0: 0,"
-                    "x1: currenttime,"
+                    "x1: index,"
                     "y1: 255,"
                     "line: {"
                     "color: 'lightgrey',"
@@ -757,7 +794,7 @@ void init_webserver() {
                     "}"
                     "setInterval(loadData, 10000);"
                     "loadData();"
-                    "function updateLightState() {"
+                    "function updateLightState() {" // load the light data from server and set on state and brightness
                     "for (let i = 1; i <= 4; i++) {"
                     "const lightURL = `http://192.168.0.26/state?light=${i}`;"
                     "fetch(lightURL)"
diff --git a/firmware/timing_control.ino b/firmware/timing_control.ino
index 026961a..d77ee1f 100644
--- a/firmware/timing_control.ino
+++ b/firmware/timing_control.ino
@@ -1,6 +1,7 @@
 #include <ESP8266WiFi.h>
 #include <WiFiUdp.h>
 #include <NTPClient.h>
+#include <TimeLib.h>
 
 #include "config.h"
 
@@ -24,10 +25,8 @@ bool tc_testOngoing = false;
 
 uint32_t tc_last_check = 60000;
 
-long utcOffsetInSeconds = 3600;
-
 WiFiUDP ntpUDP;
-NTPClient timeClient(ntpUDP, MY_NTP_SERVER, utcOffsetInSeconds);
+NTPClient timeClient(ntpUDP, MY_NTP_SERVER);
 
 struct tc_data_st {
   uint8_t hh;
@@ -87,6 +86,10 @@ void tc_init()
 
   tc_last_check = millis();
 
+  // Set the timezone to Europe/Berlin
+  setenv("TZ", "CET-1CEST,M3.5.0,M10.5.0/3", 1);
+  tzset();
+
   timeClient.begin();
 
   Serial.println("TC: Read data block from eeprom");
@@ -145,8 +148,10 @@ void tc_update_main()
   {
     //Serial.println((String)tc_data[i].hh + ":" + (String)tc_data[i].mm);
 
-    if (tc_data[i].hh <= timeClient.getHours()    &&
-        tc_data[i].mm <= timeClient.getMinutes())
+    /*if (tc_data[i].hh <= timeClient.getHours()    &&
+        tc_data[i].mm <= timeClient.getMinutes())*/
+    if (tc_data[i].hh <= hour()    &&
+        tc_data[i].mm <= minute())
     {
           target_data_block = i+1; // found the next block to load
     }
@@ -193,7 +198,11 @@ void tc_update_main()
   }
 
   Serial.println("-----\ntdb = " + (String)target_data_block);
-  Serial.print("target time: "); Serial.print(tc_data[target_data_block].hh); Serial.print(":"); Serial.print(tc_data[target_data_block].mm); Serial.println();
+  Serial.print("target time: ");
+  Serial.print(tc_data[target_data_block].hh);
+  Serial.print(":");
+  Serial.print(tc_data[target_data_block].mm);
+  Serial.println();
 
   // set the channels current and target brightness
   bri[0] = tc_data[target_data_block].ch1;
@@ -273,33 +282,34 @@ void tc_updateTime()
   if (timeClient.update() || millis() > (tc_last_check + TIME_CHECK_INTERVAL_MS))
   {
     tc_last_check = millis();
-    //Serial.println("TC: Read time from server...");
-    //Serial.println(timeClient.getFormattedTime());
 
-    /*
-    if (dow == 7 && mo == 10 && d >= 25 && h == 3 && DST==1) 
-    { 
-      // DST=0;
-      timeClient.setTimeOffset(utcOffsetInSeconds);
-      timeClient.forceUpdate();
-    } else if (dow == 7 && mo == 3 && d >= 25 && h ==2 && DST==0) 
-    {
-      // DST = 1
-      timeClient.setTimeOffset(utcOffsetInSeconds * 2);
-      timeClient.forceUpdate();
-    }
-    */
+    adjustTimeForDST();
 
     Serial.print("=====\nLocal time: ");
-    Serial.print(timeClient.getHours());
+    Serial.print(hour());
     Serial.print(":");
-    Serial.println(timeClient.getMinutes());
+    Serial.println(minute());
   }
   /**/
 }
 
 //********************************//
 
+void adjustTimeForDST()
+{
+
+  // Get the time and date information
+  time_t now = timeClient.getEpochTime();
+  struct tm timeinfo;
+  localtime_r(&now, &timeinfo);
+
+  // set the local time
+  setTime(timeinfo.tm_hour, timeinfo.tm_min, timeinfo.tm_sec, timeinfo.tm_mday, timeinfo.tm_mon + 1, timeinfo.tm_year + 1900);
+
+}
+
+//********************************//
+
 void tc_readConfig()
 {
   for (uint8_t i = 0; i < NUMBER_OF_TIMER_DATA_BLOCKS; i++)
@@ -383,7 +393,12 @@ String tc_getJsonData()
       output += ",";
     }
   }
-  output += "], \"currenttime\": \"" + (String)timeClient.getHours() + ":" + (String)timeClient.getMinutes() + "\"}";
+  if (tc_testOngoing == false)
+  {
+    output += "], \"currenttime\":{\"hour\":" + (String)timeClient.getHours() + ",\"min\":" + (String)timeClient.getMinutes() + "}}";
+  } else {
+    output += "], \"currenttime\":{\"hour\":16,\"min\":0}}";
+  }
   return output;
 }