diff --git a/tasmota/tasmota.ino b/tasmota/tasmota.ino
index 4a820a229..d33d122f6 100644
--- a/tasmota/tasmota.ino
+++ b/tasmota/tasmota.ino
@@ -158,6 +158,7 @@ RTC_NOINIT_ATTR TRtcSettings RtcDataSettings;
 #endif  // ESP32
 
 struct TIME_T {
+  uint32_t      nanos;
   uint8_t       second;
   uint8_t       minute;
   uint8_t       hour;
diff --git a/tasmota/tasmota_support/support_rtc.ino b/tasmota/tasmota_support/support_rtc.ino
index 85efa6a84..1c10811fc 100644
--- a/tasmota/tasmota_support/support_rtc.ino
+++ b/tasmota/tasmota_support/support_rtc.ino
@@ -43,10 +43,12 @@ struct RTC {
   uint32_t standard_time = 0;
   uint32_t midnight = 0;
   uint32_t restart_time = 0;
+  uint32_t nanos = 0;
   uint32_t millis = 0;
 //  uint32_t last_sync = 0;
   int32_t time_timezone = 0;
   bool time_synced = false;
+  bool last_synced = false;
   bool midnight_now = false;
   bool user_time_entry = false;               // Override NTP by user setting
 } Rtc;
@@ -235,11 +237,14 @@ uint32_t RtcMillis(void) {
   return (millis() - Rtc.millis) % 1000;
 }
 
-void BreakTime(uint32_t time_input, TIME_T &tm) {
+void BreakNanoTime(uint32_t time_input, uint32_t time_nanos, TIME_T &tm) {
 // break the given time_input into time components
 // this is a more compact version of the C library localtime function
 // note that year is offset from 1970 !!!
 
+  time_input += time_nanos / 1000000000U;
+  tm.nanos = time_nanos % 1000000000U;
+
   uint8_t year;
   uint8_t month;
   uint8_t month_length;
@@ -290,6 +295,10 @@ void BreakTime(uint32_t time_input, TIME_T &tm) {
   tm.valid = (time_input > START_VALID_TIME);  // 2016-01-01
 }
 
+void BreakTime(uint32_t time_input, TIME_T &tm) {
+  BreakNanoTime(time_input, 0, tm);
+}
+
 uint32_t MakeTime(TIME_T &tm) {
 // assemble time elements into time_t
 // note year argument is offset from 1970
@@ -403,6 +412,7 @@ void RtcSecond(void) {
     mutex = true;
 
     Rtc.time_synced = false;
+    Rtc.last_synced = true;
     last_sync = Rtc.utc_time;
 
     if (Rtc.restart_time == 0) {
@@ -420,7 +430,13 @@ void RtcSecond(void) {
       TasmotaGlobal.rules_flag.time_set = 1;
     }
   } else {
-    Rtc.utc_time++;  // Increment every second
+    if (Rtc.last_synced) {
+      Rtc.last_synced = false;
+      uint32_t nanos = Rtc.nanos + (millis() - Rtc.millis) * 1000000U;
+      Rtc.utc_time += nanos / 1000000000U;
+      Rtc.nanos = nanos % 1000000000U;
+    } else
+      Rtc.utc_time++;  // Increment every second
   }
   Rtc.millis = millis();
 
@@ -442,7 +458,7 @@ void RtcSecond(void) {
     }
   }
 
-  BreakTime(Rtc.local_time, RtcTime);
+  BreakNanoTime(Rtc.local_time, Rtc.nanos, RtcTime);
   if (RtcTime.valid) {
     if (!Rtc.midnight) {
       Rtc.midnight = Rtc.local_time - (RtcTime.hour * 3600) - (RtcTime.minute * 60) - RtcTime.second;
diff --git a/tasmota/tasmota_support/support_wifi.ino b/tasmota/tasmota_support/support_wifi.ino
index 0700fcc2d..f202ff602 100644
--- a/tasmota/tasmota_support/support_wifi.ino
+++ b/tasmota/tasmota_support/support_wifi.ino
@@ -878,13 +878,15 @@ void WifiPollNtp() {
 
     AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("NTP: Sync time..."));
     ntp_run_time = millis();
-    uint32_t ntp_time = WifiGetNtp();
+    uint64_t ntp_nanos = WifiGetNtp();
+    uint32_t ntp_time = ntp_nanos / 1000000000;
     ntp_run_time = (millis() - ntp_run_time) / 1000;
 //    AddLog(LOG_LEVEL_DEBUG, PSTR("NTP: Runtime %d"), ntp_run_time);
     if (ntp_run_time < 5) { ntp_run_time = 0; }  // DNS timeout is around 10s
 
     if (ntp_time > START_VALID_TIME) {
       Rtc.utc_time = ntp_time;
+      Rtc.nanos = ntp_nanos % 1000000000;
       ntp_sync_minute = 60;             // Sync so block further requests
       RtcSync("NTP");
     } else {
@@ -893,7 +895,7 @@ void WifiPollNtp() {
   }
 }
 
-uint32_t WifiGetNtp(void) {
+uint64_t WifiGetNtp(void) {
   static uint8_t ntp_server_id = 0;
 
 //  AddLog(LOG_LEVEL_DEBUG, PSTR("NTP: Start NTP Sync %d ..."), ntp_server_id);
@@ -983,7 +985,13 @@ uint32_t WifiGetNtp(void) {
         ntp_server_id++;                            // Next server next time
         return 0;
       }
-      return secs_since_1900 - 2208988800UL;
+
+      uint32_t highWord = word(packet_buffer[44], packet_buffer[45]);
+      uint32_t lowWord = word(packet_buffer[46], packet_buffer[47]);
+
+      uint32_t currentNano = (((uint64_t)(highWord << 16 | lowWord)) * 1000000000) >> 32;
+
+      return (((uint64_t) secs_since_1900) - 2208988800UL) * 1000000000 + currentNano;
     }
     delay(10);
   }
diff --git a/tasmota/tasmota_xdsp_display/xdsp_15_tm1637.ino b/tasmota/tasmota_xdsp_display/xdsp_15_tm1637.ino
index a7daf61bf..144921527 100644
--- a/tasmota/tasmota_xdsp_display/xdsp_15_tm1637.ino
+++ b/tasmota/tasmota_xdsp_display/xdsp_15_tm1637.ino
@@ -987,9 +987,12 @@ bool CmndTM1637Clock(void)
 \*********************************************************************************************/
 void TM1637ShowTime()
 {
-  uint8_t hr = RtcTime.hour;
-  uint8_t mn = RtcTime.minute;
-  uint8_t sc = RtcTime.second;
+  struct TIME_T t = RtcTime;
+  BreakNanoTime(Rtc.local_time, Rtc.nanos + (millis() - Rtc.millis) * 1000000, t);
+  uint8_t hr = t.hour;
+  uint8_t mn = t.minute;
+  uint8_t sc = t.second;
+  uint16_t ms = t.nanos / 1000000;
   
   if (!TM1637Data.clock_24)
   {
@@ -1009,12 +1012,14 @@ void TM1637ShowTime()
   
   if (TM1637 == TM1637Data.display_type)
   {
+    uint8_t colon = ms > 500? 0: 128;
     uint8_t rawBytes[1];
-    for (uint32_t i = 0; i < 4; i++)
+    uint8_t width = Settings->display_width >= 6? 6: 4;
+    for (uint32_t i = 0; i < width; i++)
     {
       rawBytes[0] = tm1637display->encode(tm[i]);
-      if ((millis() % 1000) > 500 && (i == 1))
-        rawBytes[0] = rawBytes[0] | 128;
+      if (i == 1 || (i == 3 && width > 4))
+        rawBytes[0] = rawBytes[0] | colon;
       tm1637display->printRaw(rawBytes, 1, TM1637Data.digit_order[i]);
     }
   }