title: Error: Data truncated for column 'posted' at row 1 - Date Field
body: <p>I am receiving a the following error when I try to save a post from the admin app. All the pages work correctly in the browser. I found several posts regarding this error and it seems in those cases the field has more data than the max_length has allowed. I do not understand my case since the field it is complaining about is a date field. Any assistance would be appreciated.</p>
  
  <p>Error:
  Data truncated for column 'posted' at row 1</p>
  
  <p>Link to the traceback:
  <a href="http://dpaste.com/1429237/" rel="nofollow">http://dpaste.com/1429237/</a></p>
  
  <p>My Model:</p>
  
  <pre><code>class Blog(models.Model):
      title = models.CharField(max_length=100, unique=True)
      slug = models.SlugField(max_length=100, unique=True)
      body = models.TextField()
      posted = models.DateTimeField(db_index=True, auto_now_add=True)
      category = models.ForeignKey('blog.Category')
  
      def __unicode__(self):
          return '%s' % self.title
  
      @permalink
      def get_absolute_url(self):
          return 'view_blog_post', None, { 'slug': self.slug }
  
  
  class Category(models.Model):
      title = models.CharField(max_length=100, db_index=True)
      slug = models.SlugField(max_length=100, db_index=True)
  
      def __unicode__(self):
          return '%s' % self.title
  
      @permalink
      def get_absolute_url(self):
          return 'view_blog_category', None, { 'slug': self.slug }
  </code></pre>