Adding proper Date support

Author: therealparmesh

index.js

@@ -12,6 +12,10 @@ function isArray (value) {
   return Array.isArray(value)
 }
 
+function isDate (value) {
+  return value instanceof Date
+}
+
 function isBlob (value) {
   return value &&
     typeof value.size === 'number' &&
@@ -25,10 +29,6 @@ function isFile (value) {
     typeof value.name === 'string'
 }
 
-function isDate (value) {
-  return value instanceof Date
-}
-
 function objectToFormData (obj, fd, pre) {
   fd = fd || new FormData()
 
@@ -40,7 +40,9 @@ function objectToFormData (obj, fd, pre) {
 
       objectToFormData(value, fd, key)
     })
-  } else if (isObject(obj) && !isFile(obj) && !isDate(obj)) {
+  } else if (isDate(obj)) {
+    fd.append(pre, obj.toISOString())
+  } else if (isObject(obj) && !isDate(obj) && !isFile(obj)) {
     Object.keys(obj).forEach(function (prop) {
       var value = obj[prop]
 

test/index.js

@@ -109,34 +109,6 @@ test('empty string', t => {
   t.is(formData.get('foo'), '')
 })
 
-test('File', t => {
-  const foo = new File([], {})
-  const formData = objectToFormData({
-    foo
-  })
-
-  t.true(formData.append.calledOnce)
-  t.deepEqual(formData.append.getCall(0).args, [
-    'foo',
-    foo
-  ])
-  t.is(formData.get('foo'), foo)
-})
-
-test('Date', t => {
-  const foo = new Date()
-  const formData = objectToFormData({
-    foo
-  })
-
-  t.true(formData.append.calledOnce)
-  t.deepEqual(formData.append.getCall(0).args, [
-    'foo',
-    foo
-  ])
-  t.is(formData.get('foo'), foo.toString())
-})
-
 test('Object', t => {
   const formData = objectToFormData({
     foo: {
@@ -315,3 +287,31 @@ test('Array where key ends with "[]"', t => {
     'baz'
   ])
 })
+
+test('Date', t => {
+  const foo = new Date(2000, 0, 1, 1, 1, 1)
+  const formData = objectToFormData({
+    foo
+  })
+
+  t.true(formData.append.calledOnce)
+  t.deepEqual(formData.append.getCall(0).args, [
+    'foo',
+    foo.toISOString()
+  ])
+  t.is(formData.get('foo'), foo.toISOString())
+})
+
+test('File', t => {
+  const foo = new File([], {})
+  const formData = objectToFormData({
+    foo
+  })
+
+  t.true(formData.append.calledOnce)
+  t.deepEqual(formData.append.getCall(0).args, [
+    'foo',
+    foo
+  ])
+  t.is(formData.get('foo'), foo)
+})