diff --git a/src/app/modules/shared/components/details-fields/details-fields.component.spec.ts b/src/app/modules/shared/components/details-fields/details-fields.component.spec.ts
index 9c1639ef1..5c603ed3b 100644
--- a/src/app/modules/shared/components/details-fields/details-fields.component.spec.ts
+++ b/src/app/modules/shared/components/details-fields/details-fields.component.spec.ts
@@ -505,11 +505,23 @@ describe('DetailsFieldsComponent', () => {
       },
       expectedTimeDiff: '00:55',
     },
+    {
+      case: 'negative should return 00:00',
+      entryDates: {
+        start_date: '2021-04-15',
+        end_date: '2021-04-14',
+        start_hour: '18:05',
+        end_hour: '17:00',
+      },
+      expectedTimeDiff: '00:00',
+    },
   ];
   diffParams.map((param) => {
     it(`if [start_date, start_hour] and [end_date, end_hour] diff is ${param.case}`, () => {
       component.entryForm.setValue({ ...formValues, ...param.entryDates });
       const timeDiff = component.getTimeDifference();
+
+      expect(timeDiff).toBe(param.expectedTimeDiff);
       expect(timeDiff).toBe(param.expectedTimeDiff);
     });
   });
diff --git a/src/app/modules/shared/components/details-fields/details-fields.component.ts b/src/app/modules/shared/components/details-fields/details-fields.component.ts
index bb51c79aa..ee5380204 100644
--- a/src/app/modules/shared/components/details-fields/details-fields.component.ts
+++ b/src/app/modules/shared/components/details-fields/details-fields.component.ts
@@ -128,7 +128,7 @@ export class DetailsFieldsComponent implements OnChanges, OnInit {
     this.end_date.setValue($event);
   }
 
-  getTimeDifference() {
+  getTimeDifference(): string {
     const startDate = moment(`${this.start_date.value} ${this.start_hour.value}`);
     const endDate = moment(`${this.end_date.value} ${this.end_hour.value}`);
     if (startDate <= endDate) {