Add getFirstInstallTime(), getLastUpdateTime() function in JS.

android/src/main/java/com/learnium/RNDeviceInfo/RNDeviceInfo.java

 package com.learnium.RNDeviceInfo;
 
-import java.util.Arrays;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
 import com.facebook.react.ReactPackage;
+import com.facebook.react.bridge.JavaScriptModule;
 import com.facebook.react.bridge.NativeModule;
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.uimanager.ViewManager;
-import com.facebook.react.bridge.JavaScriptModule;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
 public class RNDeviceInfo implements ReactPackage {
 

deviceinfo.d.ts

@@ -21,3 +21,5 @@ export function getInstanceID(): string;
 export function isEmulator(): boolean;
 export function isTablet(): boolean;
 export function isPinOrFingerprintSet(): (cb: (isPinOrFingerprintSet: boolean) => void) => void;
+export function getFirstInstallTime(): string;
+export function getLastUpdateTime(): string;

deviceinfo.js

@@ -65,5 +65,11 @@ module.exports = {
   isPinOrFingerprintSet: function () {
     return RNDeviceInfo.isPinOrFingerprintSet;
   },
+  getSystemName: function () {
+    return RNDeviceInfo.firstInstallTime;
+  },
+  getSystemName: function () {
+    return RNDeviceInfo.lastUpdateTime;
+  },
   getPhoneNumber: _ => RNDeviceInfo.phoneNumber
 };