Accessing variant config name/value pairs using liquid and formatting date

bta-variant-config

/* liquid */
{% for variant in product.variants %}
  <option data-bta-config="{{ variant.metafields.bookthatapp.config }}">...</option>
{% endfor %}

{% assign configs = variant.metafields.bookthatapp.config | split: '&' %}
{% for config in configs %}
  {% assign kvp = config | split: '=' %}
  {% if kvp.first == 'start_time' %}
	  <span class="bta_config_time" data-time="{{ kvp.last }}"></span>
  {% endif %}
{% endfor %}

/* js */
$('.bta_config_time').each(function() {
  var span = $(this),
      t = span.attr('data-time'),
      d = new Date(parseInt(t, 10) * 1000),
      ld = new Date(d.getTime() + d.getTimezoneOffset() * 60000);
  
  span.text(ld.toLocaleTimeString());
});