diff --git a/src/composables/useDate.js b/src/composables/useDate.js
index 05089b1a2..be0d8c825 100644
--- a/src/composables/useDate.js
+++ b/src/composables/useDate.js
@@ -1,31 +1,28 @@
 import moment from 'moment';
 
+function convertUTCStringDateToDate(stringDate) {
+	return new Date(
+		stringDate.includes(' ')
+			? stringDate.replace(' ', 'T') + 'Z' // "2025-02-07 05:37:07" -> "2025-02-07T05:37:07Z"
+			: stringDate + 'T00:00:00Z', // "2025-02-07" -> "2025-02-07T00:00:00Z"
+	);
+}
+
 export function useDate() {
-	function calculateDaysFromNow(dateString) {
-		// Step 1: Parse input as UTC
-		const inputDate = new Date(
-			dateString.includes(' ')
-				? dateString.replace(' ', 'T') + 'Z' // "2025-02-07 05:37:07" -> "2025-02-07T05:37:07Z"
-				: dateString + 'T00:00:00Z', // "2025-02-07" -> "2025-02-07T00:00:00Z"
-		);
+	function calculateDaysBetweenDates(startDate, endDate) {
+		const oneDay = 1000 * 60 * 60 * 24; // milliseconds in one day
+		const start =
+			startDate instanceof Date
+				? startDate
+				: convertUTCStringDateToDate(startDate);
 
-		// Step 2: Get current date as UTC midnight
-		const now = new Date();
-		const nowUTC = new Date(
-			Date.UTC(
-				now.getUTCFullYear(),
-				now.getUTCMonth(),
-				now.getUTCDate(),
-				0,
-				0,
-				0,
-			),
-		);
+		const end =
+			endDate instanceof Date ? endDate : convertUTCStringDateToDate(endDate);
 
-		// Step 3: Calculate difference in whole days
-		const diffMilliseconds = inputDate - nowUTC;
-		const millisecondsPerDay = 1000 * 60 * 60 * 24; // 86,400,000 ms
-		return Math.floor(diffMilliseconds / millisecondsPerDay);
+		start.setUTCHours(0, 0, 0, 0);
+		end.setUTCHours(0, 0, 0, 0);
+		const difference = end - start; // difference in milliseconds
+		return Math.round(difference / oneDay);
 	}
 
 	function formatShortDate(dateString) {
@@ -36,5 +33,5 @@ export function useDate() {
 		return moment(dateString).format('YYYY-MM-DD hh:mm A');
 	}
 
-	return {calculateDaysFromNow, formatShortDate, formatDateAndTime};
+	return {calculateDaysBetweenDates, formatShortDate, formatDateAndTime};
 }
diff --git a/src/composables/useDate.test.js b/src/composables/useDate.test.js
new file mode 100644
index 000000000..312220ee0
--- /dev/null
+++ b/src/composables/useDate.test.js
@@ -0,0 +1,34 @@
+import {describe, test, expect} from 'vitest';
+import {useDate} from './useDate';
+
+describe('calculateDaysFromNow', () => {
+	const {calculateDaysBetweenDates} = useDate();
+	test('today date should result in 0 days', () => {
+		expect(
+			calculateDaysBetweenDates('2025-02-20 08:10:27', '2025-02-20 11:00:00'),
+		).toBe(0);
+
+		expect(
+			calculateDaysBetweenDates('2025-02-20 23:10:27', '2025-02-20 11:00:00'),
+		).toBe(0);
+	});
+	test('tomorrow should always result in 1 day', () => {
+		expect(
+			calculateDaysBetweenDates('2025-02-19 08:10:27', '2025-02-20 11:00:00'),
+		).toBe(1);
+
+		expect(
+			calculateDaysBetweenDates('2025-02-19 23:10:27', '2025-02-20 11:00:00'),
+		).toBe(1);
+	});
+
+	test('yesterday should always result in -1 day', () => {
+		expect(
+			calculateDaysBetweenDates('2025-02-21 08:10:27', '2025-02-20 11:00:00'),
+		).toBe(-1);
+
+		expect(
+			calculateDaysBetweenDates('2025-02-21 23:10:27', '2025-02-20 11:00:00'),
+		).toBe(-1);
+	});
+});
diff --git a/src/pages/dashboard/components/DashboardTable/CellSubmissionDays.vue b/src/pages/dashboard/components/DashboardTable/CellSubmissionDays.vue
index c67ffe771..236092aed 100644
--- a/src/pages/dashboard/components/DashboardTable/CellSubmissionDays.vue
+++ b/src/pages/dashboard/components/DashboardTable/CellSubmissionDays.vue
@@ -11,9 +11,9 @@ const props = defineProps({
 	item: {type: Object, required: true},
 });
 
-const {calculateDaysFromNow} = useDate();
+const {calculateDaysBetweenDates} = useDate();
 
 const days = computed(() => {
-	return calculateDaysFromNow(props.item.dateLastActivity);
+	return calculateDaysBetweenDates(props.item.dateLastActivity, new Date());
 });
 </script>
diff --git a/src/pages/dashboard/composables/useReviewActivityLogic.js b/src/pages/dashboard/composables/useReviewActivityLogic.js
index 2b75a070f..8f1a22a83 100644
--- a/src/pages/dashboard/composables/useReviewActivityLogic.js
+++ b/src/pages/dashboard/composables/useReviewActivityLogic.js
@@ -4,7 +4,7 @@ import {RecommendationTranslations} from '@/composables/useSubmission';
 import {Actions as ReviewerManagerActions} from '@/managers/ReviewerManager/useReviewerManagerActions';
 const {tk, t} = useLocalize();
 
-const {calculateDaysFromNow} = useDate();
+const {calculateDaysBetweenDates} = useDate();
 const ReviewActivityActions = {
 	RESEND_REVIEW_REQUEST: 'resendReviewRequest',
 	EDIT_DUE_DATE: 'editDueDate',
@@ -270,7 +270,10 @@ const ConfigPerStatus = {
 
 function getDays(config, reviewAssignment) {
 	if (config.dateToDisplay) {
-		return calculateDaysFromNow(reviewAssignment[config.dateToDisplay]);
+		return calculateDaysBetweenDates(
+			new Date(),
+			reviewAssignment[config.dateToDisplay],
+		);
 	}
 
 	return null;