diff --git a/controller/save.controller.js b/controller/save.controller.js
index ad428a8..938204d 100644
--- a/controller/save.controller.js
+++ b/controller/save.controller.js
@@ -15,7 +15,6 @@ const save = async (
 ) => {
   if (token === configs.verifyToken) {
     try {
-      const date = new Date();
       // Önce kaydı bulalım
       const existingDevice = await DeviceModel.findOne({
         device_name,
@@ -35,7 +34,7 @@ const save = async (
           model,
           firmware_version,
           device_ip_address,
-          update_time: date,
+          update_time: new Date(Date.now()),
           device_log: {
             sensor_value,
             battery_life
@@ -54,16 +53,27 @@ const save = async (
           firmware_version
         };
 
-        const update = {
-          $set: {
-            device_ip_address,
-            update_time: date,
-            device_log: {
-              sensor_value,
-              battery_life
+        let update;
+
+        if (sensor_value === undefined && battery_life === undefined) {
+          update = {
+            $set: {
+              device_ip_address,
+              update_time: new Date(Date.now()),
             }
-          }
-        };
+          };
+        } else {
+          update = {
+            $set: {
+              device_ip_address,
+              update_time: new Date(Date.now()),
+              device_log: {
+                sensor_value,
+                battery_life
+              }
+            }
+          };
+        }
 
         const result = await DeviceModel.updateOne(filter, update);
 
diff --git a/library/index.js b/library/index.js
index f8b267b..269c589 100644
--- a/library/index.js
+++ b/library/index.js
@@ -19,7 +19,7 @@ const saveDeviceLog = async (
           remote_name,
           remote_type,
           operating_type,
-          log_time: Date.now()
+          log_time: new Date(Date.now())
         }
       }
     };
diff --git a/models/device.model.js b/models/device.model.js
index 7c29683..4afd1a5 100644
--- a/models/device.model.js
+++ b/models/device.model.js
@@ -13,8 +13,7 @@ const deviceLogSchema = new Schema({
     type: String // Toggle - Homekit Reset - Reset
   },
   log_time: {
-    type: Date,
-    default: Date.now()
+    type: String
   },
   sensor_value: {
     type: Number
@@ -50,8 +49,7 @@ const deviceSchema = new Schema({
     unique: true
   },
   update_time: {
-    type: Date,
-    default: Date.now()
+    type: String
   },
   device_log: [deviceLogSchema]
 });