make default date format public

plugins/cost-insights/src/types/Duration.ts

@@ -26,3 +26,5 @@ export enum Duration {
   P1M = 'P1M',
   P3M = 'P3M',
 }
+
+export const DEFAULT_DATE_FORMAT = 'YYYY-MM-DD';

plugins/cost-insights/src/utils/duration.ts

@@ -15,11 +15,9 @@
  */
 
 import moment from 'moment';
-import { Duration } from '../types';
+import { Duration, DEFAULT_DATE_FORMAT } from '../types';
 import { assertNever } from './assert';
 
-export const DEFAULT_DATE_FORMAT = 'YYYY-MM-DD';
-
 /**
  * Derive the start date of a given period, assuming two repeating intervals.
  *