diff --git a/sonoff/_releasenotes.ino b/sonoff/_releasenotes.ino
index d5b3e337d..afb273229 100644
--- a/sonoff/_releasenotes.ino
+++ b/sonoff/_releasenotes.ino
@@ -9,6 +9,7 @@
  * Add Home Assistant clear other device (#1931)
  * Add Restart time to Status 1 (#1938)
  * Change Sonoff SC JSON format (#1939)
+ * Fix compile error when define HOME_ASSISTANT_DISCOVERY_ENABLE is not set (#1937)
  *
  * 5.12.0a
  * Change platformio option sonoff-ds18x20 to sonoff-xxl enabling ds18x20 and all other sensors in one image
diff --git a/sonoff/settings.ino b/sonoff/settings.ino
index 0c3edfe8c..f77955ebd 100644
--- a/sonoff/settings.ino
+++ b/sonoff/settings.ino
@@ -50,6 +50,10 @@
 #define MTX_ADDRESS8           0
 #endif
 
+#ifndef HOME_ASSISTANT_DISCOVERY_ENABLE
+#define HOME_ASSISTANT_DISCOVERY_ENABLE 0
+#endif
+
 /*********************************************************************************************\
  * RTC memory
 \*********************************************************************************************/
diff --git a/sonoff/sonoff.h b/sonoff/sonoff.h
index 834ba3f40..a46044910 100644
--- a/sonoff/sonoff.h
+++ b/sonoff/sonoff.h
@@ -114,6 +114,7 @@ enum WeekInMonthOptions {Last, First, Second, Third, Fourth};
 enum DayOfTheWeekOptions {Sun=1, Mon, Tue, Wed, Thu, Fri, Sat};
 enum MonthNamesOptions {Jan=1, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec};
 enum HemisphereOptions {North, South};
+enum GetDateAndTimeOptions { DT_LOCAL, DT_UTC, DT_RESTART, DT_UPTIME };
 
 enum LoggingLevels {LOG_LEVEL_NONE, LOG_LEVEL_ERROR, LOG_LEVEL_INFO, LOG_LEVEL_DEBUG, LOG_LEVEL_DEBUG_MORE, LOG_LEVEL_ALL};
 
diff --git a/sonoff/sonoff.ino b/sonoff/sonoff.ino
index 711a296fd..1f2a524d9 100644
--- a/sonoff/sonoff.ino
+++ b/sonoff/sonoff.ino
@@ -1743,7 +1743,7 @@ void PublishStatus(uint8_t payload)
 
   if ((0 == payload) || (1 == payload)) {
     snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_CMND_STATUS D_STATUS1_PARAMETER "\":{\"" D_JSON_BAUDRATE "\":%d,\"" D_CMND_GROUPTOPIC "\":\"%s\",\"" D_CMND_OTAURL "\":\"%s\",\"" D_JSON_UPTIME "\":\"%s\",\"" D_JSON_STARTUPUTC "\":\"%s\",\"" D_CMND_SLEEP "\":%d,\"" D_JSON_BOOTCOUNT "\":%d,\"" D_JSON_SAVECOUNT "\":%d,\"" D_JSON_SAVEADDRESS "\":\"%X\"}}"),
-      baudrate, Settings.mqtt_grptopic, Settings.ota_url, GetDateAndTime(3).c_str(), GetDateAndTime(2).c_str(), Settings.sleep, Settings.bootcount, Settings.save_flag, GetSettingsAddress());
+      baudrate, Settings.mqtt_grptopic, Settings.ota_url, GetDateAndTime(DT_UPTIME).c_str(), GetDateAndTime(DT_RESTART).c_str(), Settings.sleep, Settings.bootcount, Settings.save_flag, GetSettingsAddress());
     MqttPublishPrefixTopic_P(option, PSTR(D_CMND_STATUS "1"));
   }
 
@@ -1816,7 +1816,7 @@ void MqttShowState()
 {
   char stemp1[33];
 
-  snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{\"" D_JSON_TIME "\":\"%s\",\"" D_JSON_UPTIME "\":\"%s\""), mqtt_data, GetDateAndTime(0).c_str(), GetDateAndTime(3).c_str());
+  snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{\"" D_JSON_TIME "\":\"%s\",\"" D_JSON_UPTIME "\":\"%s\""), mqtt_data, GetDateAndTime(DT_LOCAL).c_str(), GetDateAndTime(DT_UPTIME).c_str());
 #ifdef USE_ADC_VCC
   dtostrfd((double)ESP.getVcc()/1000, 3, stemp1);
   snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s,\"" D_JSON_VCC "\":%s"), mqtt_data, stemp1);
@@ -1836,7 +1836,7 @@ void MqttShowState()
 
 boolean MqttShowSensor()
 {
-  snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{\"" D_JSON_TIME "\":\"%s\""), mqtt_data, GetDateAndTime(0).c_str());
+  snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{\"" D_JSON_TIME "\":\"%s\""), mqtt_data, GetDateAndTime(DT_LOCAL).c_str());
   int json_data_start = strlen(mqtt_data);
   for (byte i = 0; i < MAX_SWITCHES; i++) {
     if (pin[GPIO_SWT1 +i] < 99) {
@@ -1927,7 +1927,7 @@ void PerformEverySecond()
 
   if ((2 == RtcTime.minute) && latest_uptime_flag) {
     latest_uptime_flag = false;
-    snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_JSON_TIME "\":\"%s\",\"" D_JSON_UPTIME "\":\"%s\"}"), GetDateAndTime(0).c_str(), GetDateAndTime(3).c_str());
+    snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_JSON_TIME "\":\"%s\",\"" D_JSON_UPTIME "\":\"%s\"}"), GetDateAndTime(DT_LOCAL).c_str(), GetDateAndTime(DT_UPTIME).c_str());
     MqttPublishPrefixTopic_P(TELE, PSTR(D_RSLT_UPTIME));
   }
   if ((3 == RtcTime.minute) && !latest_uptime_flag) {
diff --git a/sonoff/support.ino b/sonoff/support.ino
index 870b7556c..a086f1207 100644
--- a/sonoff/support.ino
+++ b/sonoff/support.ino
@@ -1027,16 +1027,12 @@ String GetBuildDateAndTime()
 
 String GetDateAndTime(byte time_type)
 {
-  /* 0 - Local Date and Time
-     1 - UTC Date and Time
-     2 - UTC Restart Date and Time
-     3 - Uptime
-  */
+  // enum GetDateAndTimeOptions { DT_LOCAL, DT_UTC, DT_RESTART, DT_UPTIME };
   // "2017-03-07T11:08:02" - ISO8601:2004
   char dt[21];
   TIME_T tmpTime;
 
-  if (3 == time_type) {
+  if (DT_UPTIME == time_type) {
     if (restart_time) {
       BreakTime(utc_time - restart_time, tmpTime);
     } else {
@@ -1050,11 +1046,11 @@ String GetDateAndTime(byte time_type)
       tmpTime.days, tmpTime.hour, tmpTime.minute, tmpTime.second);
   } else {
     switch (time_type) {
-      case 1:
+      case DT_UTC:
         BreakTime(utc_time, tmpTime);
         tmpTime.year += 1970;
         break;
-      case 2:
+      case DT_RESTART:
         if (restart_time == 0) {
           return "";
         }
diff --git a/sonoff/webserver.ino b/sonoff/webserver.ino
index 83f91208e..87766e73d 100644
--- a/sonoff/webserver.ino
+++ b/sonoff/webserver.ino
@@ -1598,7 +1598,7 @@ void HandleInformation()
   func += F(D_PROGRAM_VERSION "}2"); func += my_version;
   func += F("}1" D_BUILD_DATE_AND_TIME "}2"); func += GetBuildDateAndTime();
   func += F("}1" D_CORE_AND_SDK_VERSION "}2" ARDUINO_ESP8266_RELEASE "/"); func += String(ESP.getSdkVersion());
-  func += F("}1" D_UPTIME "}2"); func += GetDateAndTime(3);
+  func += F("}1" D_UPTIME "}2"); func += GetDateAndTime(DT_UPTIME);
   snprintf_P(stopic, sizeof(stopic), PSTR(" at %X"), GetSettingsAddress());
   func += F("}1" D_FLASH_WRITE_COUNT "}2"); func += String(Settings.save_flag); func += stopic;
   func += F("}1" D_BOOT_COUNT "}2"); func += String(Settings.bootcount);
diff --git a/sonoff/xdrv_03_energy.ino b/sonoff/xdrv_03_energy.ino
index 81376a9d5..bf29ed6be 100644
--- a/sonoff/xdrv_03_energy.ino
+++ b/sonoff/xdrv_03_energy.ino
@@ -748,7 +748,7 @@ void EnergyMarginCheck()
 void EnergyMqttShow()
 {
 // {"Time":"2017-12-16T11:48:55","ENERGY":{"Total":0.212,"Yesterday":0.000,"Today":0.014,"Period":2.0,"Power":22.0,"Factor":1.00,"Voltage":213.6,"Current":0.100}}
-  snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_JSON_TIME "\":\"%s\""), GetDateAndTime(0).c_str());
+  snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"" D_JSON_TIME "\":\"%s\""), GetDateAndTime(DT_LOCAL).c_str());
   EnergyShow(1);
   snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s}"), mqtt_data);
   MqttPublishPrefixTopic_P(TELE, PSTR(D_RSLT_ENERGY), Settings.flag.mqtt_sensor_retain);
diff --git a/sonoff/xplg_wemohue.ino b/sonoff/xplg_wemohue.ino
index 986dd9947..a1f3d8ce8 100644
--- a/sonoff/xplg_wemohue.ino
+++ b/sonoff/xplg_wemohue.ino
@@ -544,7 +544,7 @@ void HueConfigResponse(String *response)
   response->replace("{ms", WiFi.subnetMask().toString());
   response->replace("{gw", WiFi.gatewayIP().toString());
   response->replace("{br", HueBridgeId());
-  response->replace("{dt", GetDateAndTime(1));
+  response->replace("{dt", GetDateAndTime(DT_UTC));
   response->replace("{id", GetHueUserId());
 }