fix(ui): revert backend breaking changes to mau (datahub-project#12461)

Author: kevinkarchacryl

datahub-graphql-core/src/main/java/com/linkedin/datahub/graphql/analytics/resolver/GetChartsResolver.java

@@ -85,20 +85,8 @@ private TimeSeriesChart getActiveUsersTimeSeriesChart(
       final String title,
       final DateInterval interval) {
 
-    final DateRange dateRange;
-
-    // adjust month to show 1st of month rather than last day of previous month
-    if (interval == DateInterval.MONTH) {
-      dateRange =
-          new DateRange(
-              String.valueOf(beginning.plusDays(1).getMillis()), // Shift start by 1 day
-              String.valueOf(end.plusDays(1).getMillis()) // Shift end by 1 day
-              );
-    } else {
-      // week display starting Sundays
-      dateRange =
-          new DateRange(String.valueOf(beginning.getMillis()), String.valueOf(end.getMillis()));
-    }
+    final DateRange dateRange =
+        new DateRange(String.valueOf(beginning.getMillis()), String.valueOf(end.getMillis()));
 
     final List<NamedLine> timeSeriesLines =
         _analyticsService.getTimeseriesChart(

datahub-graphql-core/src/test/java/com/linkedin/datahub/graphql/utils/DateUtilTest.java

@@ -47,26 +47,4 @@ public void testStartOfNextWeek() {
     Mockito.when(dateUtil.getNow()).thenReturn(setTimeParts(8, false));
     assertEqualStartOfNextWeek(dateUtil, 9);
   }
-
-  // validates logic to display correct dates in MAU chart
-  @Test
-  public void testDateAdjustmentsForMonth() {
-    DateUtil dateUtil = Mockito.spy(DateUtil.class);
-
-    Mockito.when(dateUtil.getNow()).thenReturn(new DateTime(2024, 11, 15, 0, 0, 0));
-
-    // start date should be next month minus a day
-    // but we want to display Dec 1 instead of Nov 30, so add a day and verify it's Dec
-    DateTime startOfNextMonthMinus12 = dateUtil.getStartOfNextMonth().minusMonths(12);
-    DateTime adjustedStart = startOfNextMonthMinus12.minusMillis(1).plusDays(1);
-    assertEquals(12, adjustedStart.getMonthOfYear()); // Verify it is December
-    assertEquals(2023, adjustedStart.getYear()); // Verify it is 2023
-
-    // verify that the end date displays correctly
-    // the chart will display Oct 1 as the last month because we don't show current month
-    DateTime startOfThisMonth = dateUtil.getStartOfThisMonth();
-    DateTime adjustedEnd = startOfThisMonth.minusMillis(1).plusDays(1);
-    assertEquals(11, adjustedEnd.getMonthOfYear()); // Verify it is November
-    assertEquals(2024, adjustedEnd.getYear()); // Verify it is 2024
-  }
 }