Facebook Open Graph meta tag for date of an event?
<p>I am trying to create meta tags for Facebook sharing option with the open graph protocol. I have different tags like in the following snippet:</p>

<pre><code>&lt;meta property="og:type" content="business.business" /&gt;
&lt;meta property="og:url" content="http://www.mywebsite.com/journal" /&gt;
&lt;meta property="og:image" content="http://mywebsite.com/images/stories/beautifulimagelikeyou.jpg" /&gt;
&lt;meta property="og:site_name" content="My website" /&gt;
&lt;meta property="og:description" content="Description of my wonderful page" /&gt;
</code></pre>

<p><strong>I am looking for a meta tag to add the scheduled date of an event</strong> (e.g. a concert) and there seem to be nothing other than <code>xxx:release-time</code> or <code>xxx:published-time</code> (<a href="http://ogp.me/" rel="noreferrer">checked on the documenation</a>) and ideally I am looking to add something like </p>

<pre><code>&lt;meta property="og:date" content="2016-06-06" /&gt;
</code></pre>

<p>or</p>

<pre><code>&lt;meta property="event:date" content="2016-06-06" /&gt;
</code></pre>

<p>has anyone ever used this kind of tag? because both <a href="http://ogp.me/" rel="noreferrer">og docs</a> and <a href="https://developers.facebook.com/docs/sharing/opengraph" rel="noreferrer">facebook docs</a> do not seem to include this kind of tag, and I don't know how to go about it. thank you.</p>