title: Date comparison Logic / in Liquid Template Filter
body: <p>I'm attempting to create a "Pre-Order" Like mechanic where certain elements of my Shopify Liquid Template only show if the current date is more or less than the date specified in a Metafield.</p>
  
  <p>As of current this is what I have including logic:</p>
  
  <pre><code>&lt;!-- Check Today is correct --&gt;
  &lt;p&gt;Today: {{'now' | date: '%d-%m-%Y' }}&lt;/p&gt;
  
  &lt;!-- This is the Metafield Output as a String --&gt;
  &lt;p&gt;Release Date: {{ product.metafields.Release-Date.preOrder }}&lt;/p&gt;
  
  &lt;!-- Assign Variable "today_date" to the current date --&gt;
  {% assign today_date = 'now' | date: '%d-%m-%Y' %}
  &lt;!-- Assign Variable "pre_date" to the string of the metafield --&gt;
  {% assign pre_date = product.metafields.Release-Date.preOrder %}
  {% if today_date &gt; pre_date %}
    Today's date is greater than PreOrder Date
  {% else %}
    Today's date is not greater than PreOrder Date
  {% endif %}
  </code></pre>
  
  <p>However, even when I set the PreOrder date to 01-01-2018 it still shows the "Is greater than".    </p>
  
  <p>How do I correctly query this?</p>