diff --git a/app/src/main/java/com/example/oplogy/CreateRoot.java b/app/src/main/java/com/example/oplogy/CreateRoot.java
index 951a473..9812283 100644
--- a/app/src/main/java/com/example/oplogy/CreateRoot.java
+++ b/app/src/main/java/com/example/oplogy/CreateRoot.java
@@ -4,25 +4,53 @@ import android.util.Log;
 
 import com.google.firebase.Timestamp;
 
+import java.text.SimpleDateFormat;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Date;
 import java.util.List;
 
 public class CreateRoot {
     public void receiveData(List<MyDataClass> myDataList) {
 
-        // デバッグ用ログ
-        for(MyDataClass data : myDataList){
-            Log.d("CreateRoot", "data: "+ data.toString());
-        }
-            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);
+        for (int i = 0; i < myDataList.size(); i++) {
+            MyDataClass data = myDataList.get(i);
+            List<Timestamp> firstDay = data.getFirstDay();
+            Timestamp startTime = firstDay.get(0);
+            Timestamp endTime = firstDay.get(1);
             Long timezone = endTime.getSeconds() - startTime.getSeconds();
             data.setTimezone(timezone);
-            Log.d("CreateRoot", "timezone: " + timezone);
-        }
 
+            Date startDate = new Date(startTime.getSeconds() * 1000);
+            Date endDate = new Date(endTime.getSeconds() * 1000);
+            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
+            String startDateString = sdf.format(startDate);
+            String endDateString = sdf.format(endDate);
+
+            // myDataList の中の data に追加する処理
+            myDataList.get(i).setTimezone(timezone);
+            myDataList.get(i).setStartDateString(startDateString);
+            myDataList.get(i).setEndDateString(endDateString);
+
+            // ログ出力
+            Log.d("CreateRoot", "(index: " + i + ") timezone: " + myDataList.get(i).getTimezone());
+            Log.d("CreateRoot", "(index: " + i + ") startDate: " + myDataList.get(i).getStartDateString());
+            Log.d("CreateRoot", "(index: " + i + ") data: " + myDataList.get(i));
+        }
+        // timezoneを比較するComparatorを作成
+        Comparator<MyDataClass> comparator = new Comparator<MyDataClass>() {
+            @Override
+            public int compare(MyDataClass data1, MyDataClass data2) {
+                return data1.getTimezone().compareTo(data2.getTimezone());
+            }
+        };
+        // myDataListをtimezoneの値でソート
+        Collections.sort(myDataList, comparator);
+        // ソート後のmyDataListをログ出力
+        for (int i = 0; i < myDataList.size(); i++) {
+            Log.d("CreateRoot", "(index: " + i + ") timezone: " + myDataList.get(i).getTimezone());
+            Log.d("CreateRoot", "(index: " + i + ") startDate: " + myDataList.get(i).getStartDateString());
+            Log.d("CreateRoot", "(index: " + i + ") data: " + myDataList.get(i));
+        }
     }
-}
+}
\ 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 7bf34dc..476c355 100644
--- a/app/src/main/java/com/example/oplogy/MyDataClass.java
+++ b/app/src/main/java/com/example/oplogy/MyDataClass.java
@@ -15,6 +15,8 @@ public class MyDataClass {
     List<Timestamp> secondDay;
     double latitude;
     private Long Timezone;
+    private String startDateString;
+    private String endDateString;
 
     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;
@@ -40,66 +42,97 @@ public class MyDataClass {
                 ", secondDay=" + secondDay +
                 '}';
     }
+
     //getter
     public String getPatronName() {
         return patronName;
     }
-    public int getClassId() {
-        return classId;
-    }
-    public List<String> getAddress() {
-        return address;
-    }
-    public List<Timestamp> getFirstDay() {
-        return firstDay;
-    }
 
-
-    public int getStudentNumber() {
-        return studentNumber;
-    }
-    public String getChildName() {
-        return childName;
-    }
-    public List<Timestamp> getThirdDay() {
-        return thirdDay;
-    }
-    public List<Timestamp> getSecondDay() {
-        return secondDay;
-    }
-    public double getLatitude() {
-        return latitude;
-    }
     //setter
     public void setPatronName(String patronName) {
         this.patronName = patronName;
     }
+
+    public int getClassId() {
+        return classId;
+    }
+
     public void setClassId(int classId) {
         this.classId = classId;
     }
+
+    public List<String> getAddress() {
+        return address;
+    }
+
     public void setAddress(List<String> address) {
         this.address = address;
     }
+
+    public List<Timestamp> getFirstDay() {
+        return firstDay;
+    }
+
     public void setFirstDay(List<Timestamp> firstDay) {
         this.firstDay = firstDay;
     }
+
+    public int getStudentNumber() {
+        return studentNumber;
+    }
+
     public void setStudentNumber(int studentNumber) {
         this.studentNumber = studentNumber;
     }
+
+    public String getChildName() {
+        return childName;
+    }
+
     public void setChildName(String childName) {
         this.childName = childName;
     }
+
+    public List<Timestamp> getThirdDay() {
+        return thirdDay;
+    }
+
     public void setThirdDay(List<Timestamp> thirdDay) {
         this.thirdDay = thirdDay;
     }
+
+    public List<Timestamp> getSecondDay() {
+        return secondDay;
+    }
+
     public void setSecondDay(List<Timestamp> secondDay) {
         this.secondDay = secondDay;
     }
+
+    public double getLatitude() {
+        return latitude;
+    }
+
     public void setLatitude(double latitude) {
         this.latitude = latitude;
     }
 
+    public void setEndDateString(String endDateString) {
+        this.endDateString = endDateString;
+    }
+
+    public Long getTimezone() {
+        return Timezone;
+    }
+
     public void setTimezone(Long Timezone) {
-        this.Timezone=Timezone;
+        this.Timezone = Timezone;
+    }
+
+    public String getStartDateString() {
+        return startDateString;
+    }
+    public void setStartDateString(String startDateString) {
+        this.startDateString = startDateString;
     }
 }
diff --git a/app/src/main/java/com/example/oplogy/RootSearchActivity.java b/app/src/main/java/com/example/oplogy/RootSearchActivity.java
index 645f113..bd1f5b9 100644
--- a/app/src/main/java/com/example/oplogy/RootSearchActivity.java
+++ b/app/src/main/java/com/example/oplogy/RootSearchActivity.java
@@ -1,9 +1,9 @@
 package com.example.oplogy;
 
-import androidx.appcompat.app.AppCompatActivity;
-
 import android.os.Bundle;
 
+import androidx.appcompat.app.AppCompatActivity;
+
 public class RootSearchActivity extends AppCompatActivity {
 
     @Override