diff --git a/public/pages/DetectorResults/containers/AnomalyResults.tsx b/public/pages/DetectorResults/containers/AnomalyResults.tsx
index b09b18b2..366573b6 100644
--- a/public/pages/DetectorResults/containers/AnomalyResults.tsx
+++ b/public/pages/DetectorResults/containers/AnomalyResults.tsx
@@ -255,6 +255,7 @@ export function AnomalyResults(props: AnomalyResultsProps) {
       endDate: adjustedCurrentTime.valueOf(),
     } as DateRange;
 
+    // build result search query params relative to data end time
     const params = buildParamsForGetAnomalyResultsWithDateRange(
       featureDataPointsRange.startDate,
       featureDataPointsRange.endDate
diff --git a/public/pages/utils/__tests__/anomalyResultUtils.test.ts b/public/pages/utils/__tests__/anomalyResultUtils.test.ts
index 914c4c1f..7c393a7e 100644
--- a/public/pages/utils/__tests__/anomalyResultUtils.test.ts
+++ b/public/pages/utils/__tests__/anomalyResultUtils.test.ts
@@ -13,6 +13,7 @@ import {
   getFeatureMissingDataAnnotations,
   getFeatureDataPointsForDetector,
   parsePureAnomalies,
+  buildParamsForGetAnomalyResultsWithDateRange,
 } from '../anomalyResultUtils';
 import { getRandomDetector } from '../../../redux/reducers/__tests__/utils';
 import {
@@ -22,11 +23,16 @@ import {
   AnomalyData,
 } from '../../../models/interfaces';
 import { ANOMALY_RESULT_SUMMARY, PARSED_ANOMALIES } from './constants';
+import { MAX_ANOMALIES } from '../../../utils/constants';
+import { SORT_DIRECTION, AD_DOC_FIELDS } from '../../../../server/utils/constants';
 
 describe('anomalyResultUtils', () => {
   let randomDetector_20_min: Detector;
   let randomDetector_20_sec: Detector;
   let feature_id = 'deny_max';
+  const startTime = 1609459200000; // January 1, 2021
+  const endTime = 1609545600000;   // January 2, 2021
+
   beforeAll(() => {
     randomDetector_20_min = {
       ...getRandomDetector(true),
@@ -569,6 +575,57 @@ describe('anomalyResultUtils', () => {
         )
       ).toEqual([]);
     });
+    test('should correctly build parameters with default options', () => {
+      const expected = {
+          from: 0,
+          size: MAX_ANOMALIES,
+          sortDirection: SORT_DIRECTION.DESC,
+          sortField: AD_DOC_FIELDS.DATA_END_TIME,
+          startTime: startTime,
+          endTime: endTime,
+          fieldName: AD_DOC_FIELDS.DATA_END_TIME,
+          anomalyThreshold: -1,
+          entityList: undefined,  // Default as an empty array stringified
+      };
+
+      const result = buildParamsForGetAnomalyResultsWithDateRange(startTime, endTime);
+      expect(result).toEqual(expected);
+  });
+
+  test('should correctly handle `anomalyOnly` and non-empty `entityList`', () => {
+      const entities = [{ id: '1', name: 'Entity1' }, { id: '2', name: 'Entity2' }];
+      const expected = {
+          from: 0,
+          size: MAX_ANOMALIES,
+          sortDirection: SORT_DIRECTION.DESC,
+          sortField: AD_DOC_FIELDS.DATA_END_TIME,
+          startTime: startTime,
+          endTime: endTime,
+          fieldName: AD_DOC_FIELDS.DATA_END_TIME,
+          anomalyThreshold: 0, // because anomalyOnly is true
+          entityList: JSON.stringify(entities),
+      };
+
+      const result = buildParamsForGetAnomalyResultsWithDateRange(startTime, endTime, true, entities);
+      expect(result).toEqual(expected);
+  });
+
+  test('should handle undefined `entityList` as an empty array JSON string', () => {
+      const expected = {
+          from: 0,
+          size: MAX_ANOMALIES,
+          sortDirection: SORT_DIRECTION.DESC,
+          sortField: AD_DOC_FIELDS.DATA_END_TIME,
+          startTime: startTime,
+          endTime: endTime,
+          fieldName: AD_DOC_FIELDS.DATA_END_TIME,
+          anomalyThreshold: -1, // default as anomalyOnly is false
+          entityList: undefined,  // Default for undefined entityList
+      };
+
+      const result = buildParamsForGetAnomalyResultsWithDateRange(startTime, endTime, false, undefined);
+      expect(result).toEqual(expected);
+  });
   });
 
   describe('parsePureAnomalies()', () => {
diff --git a/public/pages/utils/anomalyResultUtils.ts b/public/pages/utils/anomalyResultUtils.ts
index cc3408b6..1ff35b9a 100644
--- a/public/pages/utils/anomalyResultUtils.ts
+++ b/public/pages/utils/anomalyResultUtils.ts
@@ -118,6 +118,38 @@ export const getLiveAnomalyResults = (
   );
 };
 
+/**
+ * Builds search query parameters for retrieving anomaly results within a specified date range.
+ *
+ * This function constructs a parameter object for querying an anomaly detection system, filtering results
+ * by a given start and end time. It supports filtering anomalies based on a threshold and can limit results to
+ * specific entities if provided.
+ *
+ * In the context of anomaly results, the startTime and endTime parameters are used to compare against the data_end_time.
+ * Using data_end_time instead of data_start_time is crucial because, within HC heatmap cells, the startTime and
+ * endTime are derived from each cell's start and end times, which are determined based on the plotTime—coinciding
+ * with the data_end_time. This alignment ensures that the temporal data within each heatmap cell accurately
+ * reflects the intervals intended for analysis.
+ *
+ * @param startTime - The epoch time (in milliseconds) marking the start of the date range for the query.
+ * @param endTime - The epoch time (in milliseconds) marking the end of the date range for the query.
+ * @param anomalyOnly - Optional. If true, the query will return only results where anomalies are detected
+ *                      (anomaly threshold is set to 0). If false or omitted, it will include all results
+ *                      (anomaly threshold is set to -1). Default is `false`.
+ * @param entityList - Optional. An array of entities to filter the results. If omitted, results are not filtered
+ *                     by entities. Default is `undefined`.
+ *
+ * @returns An object containing the necessary parameters for the anomaly results search query. This object includes:
+ *          - `from`: The starting index for fetching results (always set to 0).
+ *          - `size`: The maximum number of anomalies to return (`MAX_ANOMALIES`).
+ *          - `sortDirection`: The sorting order of results, set to descending (`SORT_DIRECTION.DESC`).
+ *          - `sortField`: The field used to sort the data, set to data end time (`AD_DOC_FIELDS.DATA_END_TIME`).
+ *          - `startTime`: Passed start time for the search range.
+ *          - `endTime`: Passed end time for the search range.
+ *          - `fieldName`: Field used to query the data, set to data end time (`AD_DOC_FIELDS.DATA_END_TIME`).
+ *          - `anomalyThreshold`: The minimum score threshold for anomalies, dependent on `anomalyOnly` parameter.
+ *          - `entityList`: A JSON string representing the list of entities to filter the results by.
+ */
 export const buildParamsForGetAnomalyResultsWithDateRange = (
   startTime: number,
   endTime: number,
@@ -128,10 +160,10 @@ export const buildParamsForGetAnomalyResultsWithDateRange = (
     from: 0,
     size: MAX_ANOMALIES,
     sortDirection: SORT_DIRECTION.DESC,
-    sortField: AD_DOC_FIELDS.DATA_START_TIME,
+    sortField: AD_DOC_FIELDS.DATA_END_TIME,
     startTime: startTime,
     endTime: endTime,
-    fieldName: AD_DOC_FIELDS.DATA_START_TIME,
+    fieldName: AD_DOC_FIELDS.DATA_END_TIME,
     anomalyThreshold: anomalyOnly ? 0 : -1,
     entityList: JSON.stringify(entityList),
   };