Move helper inside test only

lib/components/DateTime/DatePicker.spec.tsx

@@ -5,7 +5,13 @@ import { shallow } from 'enzyme';
 import { DateFormat} from '../../Common';
 import { DatePicker} from './DatePicker';
 import { describe, it } from 'mocha';
-import { adjustForTimezone } from './helpers';
+
+const adjustForTimezone = (dateStr) => {
+    let date = new Date(dateStr);
+    let timeOffsetInMS = date.getTimezoneOffset() * 60000;
+    date.setTime(date.getTime() - timeOffsetInMS);
+    return date.toISOString();
+};
 
 describe('DatePicker', () => {
     let clock;

lib/components/DateTime/helpers.ts

@@ -51,11 +51,4 @@ export const getLocalMonths = (locale) => {
     }
 
     return monthNames;
-};
-
-export const adjustForTimezone = (dateStr) => {
-    let date = new Date(dateStr);
-    let timeOffsetInMS = date.getTimezoneOffset() * 60000;
-    date.setTime(date.getTime() - timeOffsetInMS);
-    return date.toISOString();
 };