This Liquid loop for Jekyll sorts a collection by date, to reverse the order add ` | reverse`

dogs-collection-sorted

{% comment %}

*  This loop loops through a collection called `dogs`
*  and sorts it by the front matter variable `dob` and than filters
*  the collection with `reverse` in reverse order
*
*  To make it work I first assigned the data to a new string
*  called `sorted_dogos`.

{% endcomment %}  
  {% assign sorted_dogos = site.dogs | sort: "dob" %}
  {% for dog in sorted_dogos %}
      Born: {{ dog.dob | date_to_string: "ordinal", "US" }}  
  {% endfor %}