Remove timezone migration

src/libs/DateUtils.js

@@ -1,5 +1,6 @@
 import moment from 'moment';
 import 'moment-timezone';
+import _ from 'underscore';
 import Onyx from 'react-native-onyx';
 import Str from 'expensify-common/lib/str';
 import ONYXKEYS from '../ONYXKEYS';
@@ -8,7 +9,16 @@ import CONST from '../CONST';
 let timezone;
 Onyx.connect({
     key: ONYXKEYS.MY_PERSONAL_DETAILS,
-    callback: (val) => { timezone = val ? val.timezone.selected : CONST.DEFAULT_TIME_ZONE.selected; },
+    callback: (val) => {
+        timezone = val ? val.timezone : CONST.DEFAULT_TIME_ZONE.selected;
+
+        // Make sure that if we have a timezone in object format that we're getting the selected timezone name
+        // Older timezone formats only include the timezone name, but the newer format also included whether or
+        // not the timezone was selected automatically
+        if (_.isObject(timezone)) {
+            timezone = val.timezone.selected;
+        }
+    },
 });
 
 /**

src/libs/migrateOnyx.js

@@ -1,6 +1,5 @@
 import RenameActiveClientsKey from './migrations/RenameActiveClientsKey';
 import RenamePriorityModeKey from './migrations/RenamePriorityModeKey';
-import ReformatTimezone from './migrations/ReformatTimezone';
 
 export default function () {
     const startTime = Date.now();
@@ -11,7 +10,6 @@ export default function () {
         const migrationPromises = [
             RenameActiveClientsKey,
             RenamePriorityModeKey,
-            ReformatTimezone,
         ];
 
         // Reduce all promises down to a single promise. All promises run in a linear fashion, waiting for the