diff --git a/examples/va.js b/examples/va.js
index 0f8c03b..0eef17c 100644
--- a/examples/va.js
+++ b/examples/va.js
@@ -9,14 +9,10 @@ va.getVABanks()
     return r;
   })
   .then(banks => {
-    const expDate = new Date();
-    expDate.setDate(expDate.getDate() + 7);
-
     return va.createFixedVA({
       externalID: '123',
       bankCode: banks[0].code,
       name: 'Stanley Nguyen',
-      expirationDate: expDate,
     });
   })
   .then(r => {
@@ -29,14 +25,10 @@ va.getVABanks()
     return r;
   })
   .then(({ id }) => {
-    const expDate = new Date();
-    expDate.setMonth(expDate.getMonth() + 1);
-
     return va.updateFixedVA({
       id,
       suggestedAmt: 20,
       expectedAmt: 30,
-      expirationDate: expDate,
     });
   })
   .then(r => {
diff --git a/src/va/account.js b/src/va/account.js
index e6a0a64..b7cab2e 100644
--- a/src/va/account.js
+++ b/src/va/account.js
@@ -64,7 +64,7 @@ function updateFixedVA(data) {
           expected_amount: data.expectedAmt,
           expiration_date: data.expirationDate
             ? data.expirationDate.toISOString()
-            : null,
+            : undefined,
           is_single_use: data.isSingleUse,
           description: data.description,
         }),
diff --git a/test/va/account.test.js b/test/va/account.test.js
index 816242a..efadc54 100644
--- a/test/va/account.test.js
+++ b/test/va/account.test.js
@@ -27,9 +27,30 @@ module.exports = function(x) {
     nock(x.opts.xenditURL)
       .patch(`/callback_virtual_accounts/${TestConstants.VA_ID}`, {
         expected_amount: TestConstants.EXPECTED_AMT,
-        expiration_date: null,
       })
       .reply(200, TestConstants.UPDATED_VA_DETAILS);
+    nock(x.opts.xenditURL)
+      .post('/callback_virtual_accounts', {
+        external_id: TestConstants.EXT_ID,
+        bank_code: TestConstants.BANK_CODE,
+        name: TestConstants.NAME,
+        expiration_date: null,
+      })
+      .reply(400, {
+        status: 400,
+        code: 'API_VALIDATION_ERROR',
+        message: 'There was an error with the format submitted to the server.',
+      });
+    nock(x.opts.xenditURL)
+      .patch(`/callback_virtual_accounts/${TestConstants.VA_ID}`, {
+        expected_amount: TestConstants.EXPECTED_AMT,
+        expiration_date: null,
+      })
+      .reply(400, {
+        status: 400,
+        code: 'API_VALIDATION_ERROR',
+        message: 'There was an error with the format submitted to the server.',
+      });
   });
 
   describe('createFixedVA', () => {