diff --git a/tests/simple-app-config.test.ts b/tests/simple-app-config.test.ts
index 777fa07..7017cf6 100644
--- a/tests/simple-app-config.test.ts
+++ b/tests/simple-app-config.test.ts
@@ -121,7 +121,7 @@ describe('simple-app-config Tests', () => {
 
       /* Check date against expected */
       expect(dateVal instanceof Date).toBeTruthy;
-      expect(JSON.stringify(dateVal)).toBe('"1970-01-01T00:00:10.000Z"');
+      expect(JSON.stringify((dateVal as Date).toISOString())).toBe('"1970-01-01T00:00:10.000Z"');
 
       /* Check regexp against expected */
       expect(regexpVal instanceof RegExp).toBeTruthy;
diff --git a/tests/utils/envParser.test.ts b/tests/utils/envParser.test.ts
index 03fd0c6..3742411 100644
--- a/tests/utils/envParser.test.ts
+++ b/tests/utils/envParser.test.ts
@@ -155,9 +155,7 @@ describe('envParser Tests', () => {
 
       /* Compare against expected */
       expect(result instanceof Date).toBeTruthy();
-      expect(result.getUTCFullYear()).toBe(1969);
-      expect(result.getUTCMonth()).toBe(11); // Note: Months are 0-indexed in JavaScript Dates
-      expect(result.getUTCDate()).toBe(31);
+      expect((result as Date).toISOString()).toBe('1969-12-31T08:00:00.000Z');
     });
   });
 
diff --git a/tests/utils/typeConverter.test.ts b/tests/utils/typeConverter.test.ts
index 6b046f8..9c80ead 100644
--- a/tests/utils/typeConverter.test.ts
+++ b/tests/utils/typeConverter.test.ts
@@ -103,7 +103,7 @@ describe('Type Converter Util Tests', () => {
 
       /* Compare against expected */
       expect(result instanceof Date).toBeTruthy();
-      expect(result.toJSON()).toBe('1970-01-01T00:00:01.000Z');
+      expect((result as Date).toISOString()).toBe('1970-01-01T00:00:01.000Z');
     });
 
     /* Test when converting to a Date is possible as a valid date string */
@@ -114,9 +114,7 @@ describe('Type Converter Util Tests', () => {
 
       /* Compare against expected */
       expect(result instanceof Date).toBeTruthy();
-      expect(result.getUTCFullYear()).toBe(1969);
-      expect(result.getUTCMonth()).toBe(11); // Note: Months are 0-indexed in JavaScript Dates
-      expect(result.getUTCDate()).toBe(31);
+      expect((result as Date).toISOString()).toBe('1969-12-31T08:00:00.000Z');
     });
 
     /* Test when converting to a Date is not possible */
@@ -245,11 +243,9 @@ describe('Type Converter Util Tests', () => {
       expect(result[0] instanceof Date).toBeTruthy();
       expect(result[1] instanceof Date).toBeTruthy();
       expect(result[2] instanceof Date).toBeTruthy();
-      expect(result[0].toJSON()).toBe('1970-01-01T00:00:00.100Z');
-      expect(result[1].getUTCFullYear()).toBe(1969);
-      expect(result[1].getUTCMonth()).toBe(11); // Note: Months are 0-indexed in JavaScript Dates
-      expect(result[1].getUTCDate()).toBe(31);
-      expect(result[2].toJSON()).toBe('1970-01-01T00:01:40.000Z');
+      expect((result[0] as Date).toISOString()).toBe('1970-01-01T00:00:00.100Z');
+      expect((result[1] as Date).toISOString()).toBe('1969-12-31T08:00:00.000Z');
+      expect((result[2] as Date).toISOString()).toBe('1970-01-01T00:01:40.000Z');
     });
 
     /* Test when converting to a RegExp Array is possible */