ref(pageFilters): Simplify getDefaultSelection (#31209)

static/app/components/organizations/pageFilters/utils.tsx

@@ -5,28 +5,23 @@ import isEqual from 'lodash/isEqual';
 import pick from 'lodash/pick';
 import pickBy from 'lodash/pickBy';
 
+import {DEFAULT_STATS_PERIOD} from 'sentry/constants';
 import {DATE_TIME_KEYS, URL_PARAM} from 'sentry/constants/pageFilters';
 import OrganizationsStore from 'sentry/stores/organizationsStore';
 import {PageFilters} from 'sentry/types';
 import localStorage from 'sentry/utils/localStorage';
 
-import {normalizeDateTimeParams} from './parse';
-
-const DEFAULT_DATETIME_PARAMS = normalizeDateTimeParams({});
-
 const LOCAL_STORAGE_KEY = 'global-selection';
 
 /**
  * Make a default page filters object
  */
 export function getDefaultSelection(): PageFilters {
-  const {utc, start, end, statsPeriod} = DEFAULT_DATETIME_PARAMS;
-
   const datetime = {
-    start: start || null,
-    end: end || null,
-    period: statsPeriod || '',
-    utc: typeof utc !== 'undefined' ? utc === 'true' : null,
+    start: null,
+    end: null,
+    period: DEFAULT_STATS_PERIOD,
+    utc: null,
   };
 
   return {