diff --git a/app/src/main/java/com/example/oplogy/CreateRoot.java b/app/src/main/java/com/example/oplogy/CreateRoot.java
index 9502d05..951a473 100644
--- a/app/src/main/java/com/example/oplogy/CreateRoot.java
+++ b/app/src/main/java/com/example/oplogy/CreateRoot.java
@@ -2,6 +2,8 @@ package com.example.oplogy;
 
 import android.util.Log;
 
+import com.google.firebase.Timestamp;
+
 import java.util.List;
 
 public class CreateRoot {
@@ -13,6 +15,14 @@ public class CreateRoot {
         }
             Log.d("CreateRoot", "myDataList[0]: " + myDataList.get(0).toString());
 
+        for (MyDataClass data : myDataList) {
+            Log.d("CreateRoot", "data: " + data.toString());
+            Timestamp startTime = data.getFirstDay().get(0);
+            Timestamp endTime = data.getFirstDay().get(1);
+            Long timezone = endTime.getSeconds() - startTime.getSeconds();
+            data.setTimezone(timezone);
+            Log.d("CreateRoot", "timezone: " + timezone);
+        }
 
     }
-}
\ No newline at end of file
+}
diff --git a/app/src/main/java/com/example/oplogy/MyDataClass.java b/app/src/main/java/com/example/oplogy/MyDataClass.java
index f81066f..7bf34dc 100644
--- a/app/src/main/java/com/example/oplogy/MyDataClass.java
+++ b/app/src/main/java/com/example/oplogy/MyDataClass.java
@@ -14,6 +14,7 @@ public class MyDataClass {
     List<Timestamp> thirdDay;
     List<Timestamp> secondDay;
     double latitude;
+    private Long Timezone;
 
     public MyDataClass(String patronName, int classId, List<String> address, List<Timestamp> firstDay, int studentNumber, String childName, List<Timestamp> thirdDay, List<Timestamp> secondDay) {
         this.patronName = patronName;
@@ -52,6 +53,8 @@ public class MyDataClass {
     public List<Timestamp> getFirstDay() {
         return firstDay;
     }
+
+
     public int getStudentNumber() {
         return studentNumber;
     }
@@ -95,4 +98,8 @@ public class MyDataClass {
     public void setLatitude(double latitude) {
         this.latitude = latitude;
     }
+
+    public void setTimezone(Long Timezone) {
+        this.Timezone=Timezone;
+    }
 }