Make tests locale independent (#2592) (#2593)

* Make tests locale independent (#2592)

* use newUTC for consistency

---------

Co-authored-by: Kræn Hansen <kraen.hansen@mongodb.com>

packages/date-utils/src/getDaysInUTCMonth/getDaysInUTCMonth.spec.ts

@@ -1,23 +1,26 @@
+import { Month } from '../constants';
+import { newUTC } from '../newUTC';
+
 import { getDaysInUTCMonth } from '.';
 
 describe('packages/date-utils/getDaysInUTCMonth', () => {
   test('returns the number of days in the month', () => {
-    const result = getDaysInUTCMonth(new Date(2100, 1 /* Feb */, 11));
+    const result = getDaysInUTCMonth(newUTC(2100, Month.February, 11));
     expect(result).toEqual(28);
   });
 
   test('when given the 1st of the month', () => {
-    const result = getDaysInUTCMonth(new Date(2100, 1 /* Feb */, 1));
+    const result = getDaysInUTCMonth(newUTC(2100, Month.February, 1));
     expect(result).toEqual(28);
   });
 
   test('when given the last of the month', () => {
-    const result = getDaysInUTCMonth(new Date(2100, 1 /* Feb */, 28));
+    const result = getDaysInUTCMonth(newUTC(2100, Month.February, 28));
     expect(result).toEqual(28);
   });
 
   test('when given February of a leap year', () => {
-    const result = getDaysInUTCMonth(new Date(2000, 1 /* Feb */, 1));
+    const result = getDaysInUTCMonth(newUTC(2000, Month.February, 1));
     expect(result).toEqual(29);
   });