modify setting and dbhelper

 import React, { Component } from 'react';
 import { View, Text, StyleSheet, TextInput, TouchableOpacity, Image } from 'react-native';
 import AddButton from '../component/AddButton'
+import {delete_all_data} from '../component/DBhelper'
 
 var date = new Date();
 date.setHours(date.getHours()+9);
-date.setMonth(date.getMonth()+1);
 
 export default class SettingTab extends Component {
 
@@ -40,7 +40,8 @@ export default class SettingTab extends Component {
 
     delete_id(){
         this.setState({ID: ''})
-        //기기연결 해제, 디비비우기
+        save_app_data()
+        delete_all_data()
     }
     render() {
         return (

@@ -82,6 +82,11 @@ export function get_today_data(today){
   return list;
 }
 
+export function delete_all_data(today){
+  let all_wastes = realm.objects('Waste');
+  realm.delete(all_wastes);
+}
+
 var get_date = function (date){
   return pad(date.getFullyear(),4)+pad(date.getMonth()+1, 2)+ pad(date.getDate(), 2)
 }
\ No newline at end of file