diff --git a/index.js b/index.js
index 422852d8..709a2e7b 100644
--- a/index.js
+++ b/index.js
@@ -670,12 +670,22 @@ function nested (laterCode, name, key, schema, externalSchema, fullSchema, subKe
         type.forEach((type, index) => {
           var tempSchema = {type: type}
           var nestedResult = nested(laterCode, name, key, tempSchema, externalSchema, fullSchema, subKey)
-          code += `
-            ${index === 0 ? 'if' : 'else if'}(ajv.validate(${require('util').inspect(tempSchema, {depth: null})}, obj${accessor}))
+          if (type === 'string') {
+            code += `
+              ${index === 0 ? 'if' : 'else if'}(obj${accessor} instanceof Date || ajv.validate(${require('util').inspect(tempSchema, {depth: null})}, obj${accessor}))
+                ${nestedResult.code}
+            `
+          } else {
+            code += `
+              ${index === 0 ? 'if' : 'else if'}(ajv.validate(${require('util').inspect(tempSchema, {depth: null})}, obj${accessor}))
               ${nestedResult.code}
-          `
+            `
+          }
           laterCode = nestedResult.laterCode
         })
+        code += `
+          else json+= null
+        `
       } else {
         throw new Error(`${type} unsupported`)
       }
diff --git a/test/typesArray.test.js b/test/typesArray.test.js
index d1baa272..77e97d38 100644
--- a/test/typesArray.test.js
+++ b/test/typesArray.test.js
@@ -182,3 +182,22 @@ test('object with anyOf and multiple types', (t) => {
     t.fail()
   }
 })
+
+test('string type array can handle dates', (t) => {
+  t.plan(1)
+  const schema = {
+    type: 'object',
+    properties: {
+      date: { type: ['string'] }
+    }
+  }
+  const stringify = build(schema)
+  try {
+    const value = stringify({
+      date: new Date('2018-04-20T07:52:31.017Z')
+    })
+    t.is(value, '{"date":"2018-04-20T07:52:31.017Z"}')
+  } catch (e) {
+    t.fail()
+  }
+})