diff --git a/__tests__/date.test.ts b/__tests__/date.test.ts
index f113c9b9..6257779e 100644
--- a/__tests__/date.test.ts
+++ b/__tests__/date.test.ts
@@ -30,16 +30,18 @@ describe('Date utility', () => {
         .toBe('2023-12-02 16:38:36');
     });
   });
-  it('Empty string', () => {
-    const timestamp = '             ';
-    const offset = undefined;
-    expect(convertTimestampWithOffsetToPostgresString(
-      timestamp,
-      offset
-    ))
+  it('Malformed date string', () => {
+    const timestamp = '2024/01a/01 Z';
+    expect(convertTimestampWithOffsetToPostgresString(timestamp))
+      .toBe(convertTimestampWithOffsetToPostgresString(
+        new Date().toISOString(),
+      ));
+  });
+  it('Empty string', () => {
+    const timestamp = '             ';
+    expect(convertTimestampWithOffsetToPostgresString(timestamp))
       .toBe(convertTimestampWithOffsetToPostgresString(
         new Date().toISOString(),
-        offset
       ));
   });
 });