title: ACF ordering by datetime field for upcoming events not working
body: <p>I am trying to pull a list of events that are upcoming in WordPress using the ACF DateTime picker field.</p>
  
  <p>What I thought should be a relatively simple set of <code>$args</code> is now baffling me as to why it does not work: </p>
  
  <pre><code>$args = [
   "post_type" =&gt; "event",
   "post_status" =&gt; "publish",
   "posts_per_page" =&gt; 3,
   "order" =&gt; "ASC",
   "orderby" =&gt; "meta_value",
   "cat" =&gt; implode(',', $category),
   "meta_query" =&gt; [
     [
      "key" =&gt; "event_start_date_and_time",
      "compare" =&gt; "&gt;=",
      "value" =&gt; date('U'),
      "type" =&gt; "DATETIME"
     ]
  ],
  "meta_key" =&gt; "event_start_date_and_time",
  "meta_type" =&gt; "DATE"
  ];
  </code></pre>
  
  <p>This is bringing through events but they are not all in ASC order of the start date time.</p>
  
  <p>Am I missing something obvious?</p>
  
  Documentation
  
  <p><a href="https://www.advancedcustomfields.com/resources/date-time-picker/" rel="nofollow noreferrer">https://www.advancedcustomfields.com/resources/date-time-picker/</a></p>
  
  Database values
  
  <p>ACF DateTime Picker fields will store dates in the database like the following</p>
  
  <p><code>2018-07-21 15:00:00
  </code></p>