Only support DateTimeInterface

README.md

@@ -125,7 +125,7 @@ public function toFacebookPoster($notifiable) {
 ```
 
 ### Publish Facebook scheduled post
-It is also possible to publish a scheduled post. You just have to pass a UNIX timestamp to the `scheduledFor` method.
+It is also possible to publish a scheduled post. You just need to pass an instance of `DateTimeInterface` in - so any `DateTime` or Carbon instance will work.
 
 ```php
 public function toFacebookPoster($notifiable) {

src/FacebookPosterPost.php

@@ -116,17 +116,13 @@ public function withVideo($path, $title = null, $description = null, $endpoint =
     /**
      * Schedule the post for a date in the future.
      *
-     * @param  \DateTimeInterface|int  $timestamp
+     * @param  \DateTimeInterface  $timestamp
      * @return $this
      */
-    public function scheduledFor($timestamp)
+    public function scheduledFor(DateTimeInterface $timestamp)
     {
-        $timestamp = $timestamp instanceof DateTimeInterface
-            ? $timestamp->getTimestamp()
-            : $timestamp;
-
         $this->params['published'] = false;
-        $this->params['scheduled_publish_time'] = $timestamp;
+        $this->params['scheduled_publish_time'] = $timestamp->getTimestamp();
 
         return $this;
     }

tests/FacebookPosterPostTest.php

@@ -13,22 +13,6 @@ public function it_can_be_scheduled()
     {
         $post = new FacebookPosterPost('message');
 
-        $post->scheduledFor(1234);
-
-        $result = $post->getBody();
-
-        $this->assertEquals([
-            'message' => 'message',
-            'published' => false,
-            'scheduled_publish_time' => 1234,
-        ], $result);
-    }
-
-    /** @test */
-    public function it_can_be_scheduled_with_datetime()
-    {
-        $post = new FacebookPosterPost('message');
-
         $post->scheduledFor(new DateTime('2000-01-01'));
 
         $result = $post->getBody();