diff --git a/tools/esp8266/app.cpp b/tools/esp8266/app.cpp
index d8f6321e..61897e25 100644
--- a/tools/esp8266/app.cpp
+++ b/tools/esp8266/app.cpp
@@ -61,10 +61,14 @@ void app::loop(void) {
     }
 
     if(checkTicker(&mNtpRefreshTicker, mNtpRefreshInterval)) {
-        if(!apActive) {
-            mTimestamp  = mWifi->getNtpTime();
-            DPRINTLN(DBG_INFO, "[NTP]: " + getDateTimeStr(mTimestamp));
-        }
+        if(!apActive)
+            mUpdateNtp = true;
+    }
+
+    if(mUpdateNtp) {
+        mUpdateNtp = false;
+        mTimestamp = mWifi->getNtpTime();
+        DPRINTLN(DBG_INFO, "[NTP]: " + getDateTimeStr(mTimestamp));
     }
 
     if(mShouldReboot) {
@@ -685,8 +689,9 @@ const char* app::getFieldStateClass(uint8_t fieldId) {
 
 //-----------------------------------------------------------------------------
 void app::resetSystem(void) {
-    mUptimeSecs     = 0;
-    mPrevMillis     = 0;
+    mUptimeSecs = 0;
+    mPrevMillis = 0;
+    mUpdateNtp  = false;
 
     mNtpRefreshTicker   = 0;
     mNtpRefreshInterval = NTP_REFRESH_INTERVAL; // [ms]
diff --git a/tools/esp8266/app.h b/tools/esp8266/app.h
index 012c710b..fe92bb5e 100644
--- a/tools/esp8266/app.h
+++ b/tools/esp8266/app.h
@@ -112,6 +112,14 @@ class app {
             return mTimestamp;
         }
 
+        inline void setTimestamp(uint32_t newTime) {
+            DPRINTLN(DBG_DEBUG, F("setTimestamp: ") + String(newTime));
+            if(0 == newTime)
+                mUpdateNtp = true;
+            else
+                mTimestamp = newTime;
+        }
+
         void eraseSettings(bool all = false) {
             //DPRINTLN(DBG_VERBOSE, F("main.h:eraseSettings"));
             uint8_t buf[64];
@@ -239,6 +247,7 @@ class app {
 
         eep *mEep;
         uint32_t mTimestamp;
+        bool mUpdateNtp;
 
         bool mShowRebootRequest;
 
@@ -257,7 +266,6 @@ class app {
 
         // timer
         uint32_t mTicker;
-
         uint32_t mRxTicker;
 
         // mqtt
diff --git a/tools/esp8266/defines.h b/tools/esp8266/defines.h
index f866dad0..14aa1ac0 100644
--- a/tools/esp8266/defines.h
+++ b/tools/esp8266/defines.h
@@ -13,7 +13,7 @@
 //-------------------------------------
 #define VERSION_MAJOR       0
 #define VERSION_MINOR       5
-#define VERSION_PATCH       18
+#define VERSION_PATCH       19
 
 
 //-------------------------------------
diff --git a/tools/esp8266/html/setup.html b/tools/esp8266/html/setup.html
index 7e67bfb9..0381e3fc 100644
--- a/tools/esp8266/html/setup.html
+++ b/tools/esp8266/html/setup.html
@@ -64,6 +64,10 @@
                         <input type="text" class="text" name="ntpAddr"/>
                         <label for="ntpPort">NTP Port</label>
                         <input type="text" class="text" name="ntpPort"/>
+                        <label for="ntpBtn">set system time</label>
+                        <input type="button" name="ntpBtn" id="ntpBtn" class="btn" value="from browser" onclick="setTime()"/>
+                        <input type="button" name="ntpSync" id="ntpSync" class="btn" value="sync NTP" onclick="syncTime()"/>
+                        <span id="apiResult">n/a</span>
                     </fieldset>
                     </div>
 
@@ -106,7 +110,7 @@
 
                     <label for="reboot">Reboot device after successful save</label>
                     <input type="checkbox" class="cb" name="reboot"/>
-                    <input type="submit" value="save" class="btn"/>
+                    <input type="submit" value="save" class="btn right"/>
                 </form>
             </div>
         </div>
@@ -128,6 +132,28 @@
                     ivHtml(JSON.parse('{"name":"","serial":"","channels":4,"ch_max_power":[0,0,0,0],"ch_name":["","","",""],"power_limit":1500,"power_limit_option":65535}'), highestId + 1);
             });
 
+            function apiCb(obj) {
+                var e = document.getElementById("apiResult");
+                if(obj["success"])
+                    e.innerHTML = "ok";
+                else
+                    e.innerHTML = "Error: " + obj["error"];
+            }
+
+            function setTime() {
+                var date = new Date();
+                var obj = new Object();
+                obj.cmd = "set_time";
+                obj.ts = parseInt(date.getTime() / 1000);
+                getAjax("/api/setup", apiCb, "POST", JSON.stringify(obj));
+            }
+
+            function syncTime() {
+                var obj = new Object();
+                obj.cmd = "sync_ntp";
+                getAjax("/api/setup", apiCb, "POST", JSON.stringify(obj));
+            }
+
             function ivHtml(obj, id) {
                 highestId = id;
                 if(highestId == (maxInv - 1))
diff --git a/tools/esp8266/html/style.css b/tools/esp8266/html/style.css
index 2998f3f8..258309bf 100644
--- a/tools/esp8266/html/style.css
+++ b/tools/esp8266/html/style.css
@@ -133,9 +133,8 @@ input.btn {
     background-color: #006ec0;
     color: #fff;
     border: 0px;
-    float: right;
-    margin: 10px 0px 30px 10px;
     padding: 7px 20px 7px 20px;
+    margin-bottom: 10px;
     text-transform: uppercase;
     cursor: pointer;
 }
diff --git a/tools/esp8266/webApi.cpp b/tools/esp8266/webApi.cpp
index 5461ab2a..398ce659 100644
--- a/tools/esp8266/webApi.cpp
+++ b/tools/esp8266/webApi.cpp
@@ -80,6 +80,8 @@ void webApi::onApiPostBody(AsyncWebServerRequest *request, uint8_t *data, size_t
         String path = request->url().substring(5);
         if(path == "ctrl")
             root[F("success")] = setCtrl(json, root);
+        else if(path == "setup")
+            root[F("success")] = setSetup(json, root);
         else {
             root[F("success")] = false;
             root[F("error")]   = "Path not found: " + path;
@@ -381,7 +383,24 @@ bool webApi::setCtrl(DynamicJsonDocument jsonIn, JsonObject jsonOut) {
         }
     }
     else {
-        jsonOut["error"] = "unknown 'tx_request'";
+        jsonOut[F("error")] = F("unknown 'tx_request'");
+        return false;
+    }
+
+    return true;
+}
+
+
+//-----------------------------------------------------------------------------
+bool webApi::setSetup(DynamicJsonDocument jsonIn, JsonObject jsonOut) {
+    if(F("set_time") == jsonIn[F("cmd")]) {
+        mApp->setTimestamp(jsonIn[F("ts")]);
+    }
+    else if(F("sync_ntp") == jsonIn[F("cmd")]) {
+        mApp->setTimestamp(0); // 0: update ntp flag
+    }
+    else {
+        jsonOut[F("error")] = F("unknown cmd");
         return false;
     }
 
@@ -394,6 +413,6 @@ Inverter<> *webApi::getInverter(DynamicJsonDocument jsonIn, JsonObject jsonOut)
     uint8_t id = jsonIn[F("inverter")];
     Inverter<> *iv = mApp->mSys->getInverterByPos(id);
     if(NULL == iv)
-        jsonOut["error"] = F("inverter index to high: ") + String(id);
+        jsonOut[F("error")] = F("inverter index to high: ") + String(id);
     return iv;
 }
diff --git a/tools/esp8266/webApi.h b/tools/esp8266/webApi.h
index cd42ab30..e07e7d53 100644
--- a/tools/esp8266/webApi.h
+++ b/tools/esp8266/webApi.h
@@ -42,6 +42,7 @@ class webApi {
         void getRecord(JsonObject obj, record_t<> *rec);
 
         bool setCtrl(DynamicJsonDocument jsonIn, JsonObject jsonOut);
+        bool setSetup(DynamicJsonDocument jsonIn, JsonObject jsonOut);
 
         Inverter<> *getInverter(DynamicJsonDocument jsonIn, JsonObject jsonOut);