diff --git a/tools/esp8266/app.h b/tools/esp8266/app.h
index d35cf0e6..df43bcd4 100644
--- a/tools/esp8266/app.h
+++ b/tools/esp8266/app.h
@@ -98,12 +98,12 @@ class app {
             return String(str);
         }
 
-        String getTimeStr(void) {
-            char str[20];
+        String getTimeStr(uint32_t offset = 0) {
+            char str[10];
             if(0 == mUtcTimestamp)
                 sprintf(str, "n/a");
             else
-                sprintf(str, "%02d:%02d:%02d UTC", hour(mUtcTimestamp), minute(mUtcTimestamp), second(mUtcTimestamp));
+                sprintf(str, "%02d:%02d:%02d ", hour(mUtcTimestamp + offset), minute(mUtcTimestamp + offset), second(mUtcTimestamp + offset));
             return String(str);
         }
 
@@ -115,7 +115,7 @@ class app {
             return mUtcTimestamp;
         }
 
-        inline void setTimestamp(uint32_t newTime) {
+        void setTimestamp(uint32_t newTime) {
             DPRINTLN(DBG_DEBUG, F("setTimestamp: ") + String(newTime));
             if(0 == newTime)
                 mUpdateNtp = true;
diff --git a/tools/esp8266/html/api.js b/tools/esp8266/html/api.js
index f793551a..9742a967 100644
--- a/tools/esp8266/html/api.js
+++ b/tools/esp8266/html/api.js
@@ -19,8 +19,10 @@ function getAjax(url, ptr, method="GET", json=null) {
     }
     function p() {
         if(xhr.readyState == 4) {
-            if(null != xhr.responseText)
-                ptr(JSON.parse(xhr.responseText));
+            if(null != xhr.responseText) {
+                if(null != ptr)
+                    ptr(JSON.parse(xhr.responseText));
+            }
         }
     }
 }
diff --git a/tools/esp8266/html/serial.html b/tools/esp8266/html/serial.html
index bc94fc40..2744e03b 100644
--- a/tools/esp8266/html/serial.html
+++ b/tools/esp8266/html/serial.html
@@ -85,14 +85,19 @@
 
                 if(null == root) return;
                 root = root.inverter;
-                for(var i = 0; i < root.inverter.length; i++)
-                {
+                for(var i = 0; i < root.inverter.length; i++) {
                     inv = root.inverter[i];
                     var opt = document.createElement('option');
                     opt.value = inv.id;
                     opt.innerHTML = inv.name;
                     select.appendChild(opt);
                 }
+
+                // set time offset for serial console
+                var obj = new Object();
+                obj.cmd = "serial_utc_offset";
+                obj.ts  = new Date().getTimezoneOffset() * -60;
+                getAjax("/api/setup", null, "POST", JSON.stringify(obj));
             }
 
             document.getElementById("clear").addEventListener("click", function() {
@@ -133,8 +138,7 @@
                     e.innerHTML = "Error: " + obj["error"];
             }
 
-            function get_selected_iv()
-            {
+            function get_selected_iv() {
                 var e = document.getElementById("InvID");
                 return  parseInt(e.value);
             }
diff --git a/tools/esp8266/web.cpp b/tools/esp8266/web.cpp
index 4e80fa88..5d0c8be5 100644
--- a/tools/esp8266/web.cpp
+++ b/tools/esp8266/web.cpp
@@ -474,7 +474,7 @@ void web::serialCb(String msg) {
     msg.replace("\r\n", "<rn>");
     if(mSerialAddTime) {
         if((9 + mSerialBufFill) <= WEB_SERIAL_BUF_SIZE) {
-            strncpy(&mSerialBuf[mSerialBufFill], mMain->getTimeStr().c_str(), 9);
+            strncpy(&mSerialBuf[mSerialBufFill], mMain->getTimeStr(mApi->getTimezoneOffset()).c_str(), 9);
             mSerialBufFill += 9;
         }
         else {
diff --git a/tools/esp8266/webApi.cpp b/tools/esp8266/webApi.cpp
index b0e78b46..7a2d265d 100644
--- a/tools/esp8266/webApi.cpp
+++ b/tools/esp8266/webApi.cpp
@@ -18,6 +18,8 @@ webApi::webApi(AsyncWebServer *srv, app *app, sysConfig_t *sysCfg, config_t *con
     mConfig  = config;
     mStat    = stat;
     mVersion = version;
+
+    mTimezoneOffset = 0;
 }
 
 
@@ -430,6 +432,8 @@ bool webApi::setSetup(DynamicJsonDocument jsonIn, JsonObject jsonOut) {
         mApp->setTimestamp(jsonIn[F("ts")]);
     else if(F("sync_ntp") == jsonIn[F("cmd")])
         mApp->setTimestamp(0); // 0: update ntp flag
+    else if(F("serial_utc_offset") == jsonIn[F("cmd")])
+        mTimezoneOffset = jsonIn[F("ts")];
     else if(F("discovery_cfg") == jsonIn[F("cmd")])
         mApp->mFlagSendDiscoveryConfig = true; // for homeassistant
     else {
diff --git a/tools/esp8266/webApi.h b/tools/esp8266/webApi.h
index a060a29a..783c5782 100644
--- a/tools/esp8266/webApi.h
+++ b/tools/esp8266/webApi.h
@@ -21,6 +21,10 @@ class webApi {
         void setup(void);
         void loop(void);
 
+        uint32_t getTimezoneOffset() {
+            return mTimezoneOffset;
+        }
+
     private:
         void onApi(AsyncWebServerRequest *request);
         void onApiPost(AsyncWebServerRequest *request);
@@ -59,6 +63,8 @@ class webApi {
         sysConfig_t *mSysCfg;
         statistics_t *mStat;
         char *mVersion;
+
+        uint32_t mTimezoneOffset;
 };
 
 #endif /*__WEB_API_H__*/