diff --git a/src/index.test.ts b/src/index.test.ts
index 3ff3178..142e03d 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -4,15 +4,15 @@ import { createAxiosDateTransformer } from './index';
 
 describe('axios-date-transformer', () => {
     test('transforms date strings to Date objects', async () => {
-        const response = {
+        const originalObject = {
             name: 'John Doe',
-            dob: new Date('1980-01-25T14:00:00.000Z'),
+            dob: '1980-01-25',
             issues: {
                 alpha: new Date('2022-01-25T12:30:00.000Z'),
                 beta: new Date('2022-01-26T09:45:00.000Z'),
             },
         };
-        const jsonResponse = JSON.stringify(response);
+        const jsonResponse = JSON.stringify(originalObject);
         const axiosInstance = createAxiosDateTransformer({
             baseURL: 'https://example.org',
         });
@@ -30,19 +30,19 @@ describe('axios-date-transformer', () => {
         expect(data.dob).toBeInstanceOf(Date);
 
         // Assert that the date value of 'data.dob' is the same as 'response.dob'
-        expect(data.dob.toISOString()).toEqual(response.dob.toISOString());
+        expect(data.dob.toISOString()).toEqual(new Date(originalObject.dob).toISOString());
 
         // Assert that the 'issues.alpha' property is an instance of Date
         expect(data.issues.alpha).toBeInstanceOf(Date);
 
         // Assert that the date value of 'data.issues.alpha' is the same as 'response.issues.alpha'
-        expect(data.issues.alpha.toISOString()).toEqual(response.issues.alpha.toISOString());
+        expect(data.issues.alpha.toISOString()).toEqual(originalObject.issues.alpha.toISOString());
 
         // Assert that the 'issues.beta' property is an instance of Date
         expect(data.issues.beta).toBeInstanceOf(Date);
 
         // Assert that the date value of 'data.issues.beta' is the same as 'response.issues.beta'
-        expect(data.issues.beta.toISOString()).toEqual(response.issues.beta.toISOString());
+        expect(data.issues.beta.toISOString()).toEqual(originalObject.issues.beta.toISOString());
 
         // Restore the mock adapter
         mock.restore();
diff --git a/src/index.ts b/src/index.ts
index 8a0ad32..ae4b8f1 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -4,6 +4,8 @@ interface DateTransformerConfig<T = any> extends CreateAxiosDefaults<T> {
     // placeholder interface for future configuration
 }
 
+const dateRegex = /^\d{4}-\d{2}-\d{2}(T\d{2}:\d{2}:\d{2}(?:\.\d*)?(?:[-+]\d{2}:?\d{2}|Z)?)?$/;
+
 const recursiveDateConversion = (data: any): any => {
     if (typeof data === 'object') {
         for (const key in data) {
@@ -19,7 +21,6 @@ const recursiveDateConversion = (data: any): any => {
 };
 
 const isDateString = (value: any): boolean => {
-    const dateRegex = /^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(?:\.\d*)?(?:[-+]\d{2}:?\d{2}|Z)?$/;
     return dateRegex.test(value);
 };