diff --git a/npm/ng-packs/packages/theme-shared/src/lib/adapters/date-time.adapter.ts b/npm/ng-packs/packages/theme-shared/src/lib/adapters/date-time.adapter.ts
index c461b9725b..813e2c20ff 100644
--- a/npm/ng-packs/packages/theme-shared/src/lib/adapters/date-time.adapter.ts
+++ b/npm/ng-packs/packages/theme-shared/src/lib/adapters/date-time.adapter.ts
@@ -6,11 +6,15 @@ export class DateTimeAdapter {
   value!: Partial<NgbDateTimeStruct>;
 
   fromModel(value: string | Date): Partial<NgbDateTimeStruct> | null {
-    if (!value) return null;
+    if (!value) {
+      return null;
+    }
 
     const date = new Date(value);
 
-    if (isNaN(date as unknown as number)) return null;
+    if (isNaN(date as unknown as number)) {
+      return null;
+    }
 
     this.value = {
       year: date.getFullYear(),
@@ -25,12 +29,13 @@ export class DateTimeAdapter {
   }
 
   toModel(value: Partial<NgbDateTimeStruct> | null): string {
-    if (!value) return '';
+    if (!value) {
+      return '';
+    }
 
     const now = new Date();
 
     const newValue = {
-      // TODO look for strict mode errors
       year: now.getUTCFullYear(),
       month: now.getMonth() + 1,
       day: now.getDate(),
@@ -42,15 +47,17 @@ export class DateTimeAdapter {
     } as NgbDateTimeStruct;
 
     const date = new Date(
-      newValue.year,
-      newValue.month - 1,
-      newValue.day,
-      newValue.hour,
-      newValue.minute,
-      newValue.second,
+      Date.UTC(
+        newValue.year,
+        newValue.month - 1,
+        newValue.day,
+        newValue.hour,
+        newValue.minute,
+        newValue.second,
+      ),
     );
 
-    return new Date(date).toISOString();
+    return date.toISOString().replace('Z', '');
   }
 }
 
diff --git a/npm/ng-packs/packages/theme-shared/src/lib/tests/date-time.adapter.spec.ts b/npm/ng-packs/packages/theme-shared/src/lib/tests/date-time.adapter.spec.ts
index 2c00b28fae..d6074a90cd 100644
--- a/npm/ng-packs/packages/theme-shared/src/lib/tests/date-time.adapter.spec.ts
+++ b/npm/ng-packs/packages/theme-shared/src/lib/tests/date-time.adapter.spec.ts
@@ -1,4 +1,5 @@
- import { DateTimeAdapter } from '../adapters/date-time.adapter'
+import { DateTimeAdapter } from '../adapters/date-time.adapter';
+
 describe('DateTime Adapter', () => {
   const adapter = new DateTimeAdapter();
   const date = new Date(2002, 2, 30, 13, 30, 45, 0);
@@ -9,6 +10,7 @@ describe('DateTime Adapter', () => {
   const minute = date.getMinutes();
   const second = date.getSeconds();
 
+  const isoWithoutZone = date.toISOString().replace('Z', '');
   describe('#fromModel', () => {
     test.each`
       param        | expected
@@ -23,12 +25,12 @@ describe('DateTime Adapter', () => {
 
   describe('#toModel', () => {
     test.each`
-      param                                         | expected
-      ${undefined}                                  | ${''}
-      ${null}                                       | ${''}
-      ${{ year, month, day, hour, minute, second }} | ${date.toISOString()}
+      param             | expected
+      ${undefined}      | ${''}
+      ${null}           | ${''}
+      ${isoWithoutZone} | ${isoWithoutZone}
     `('should return $expected when $param is given', ({ param, expected }) => {
-      expect(adapter.toModel(param)).toEqual(expected);
+      expect(adapter.toModel(adapter.fromModel(param))).toEqual(expected);
     });
   });
 });