Checkbox array for days of the week
This should do what you're looking for:

{% set closed = true %}

{% for dayOfWeek in theCenter.openWeekDay %}

    {% if 'now'|date('N') == dayOfWeek and 'now'|date('Hi', 'America/Denver') &gt; theCenter.openTime|date('Hi') and 'now'|date('Hi', 'America/Denver') &lt; theCenter.closeTime|date('Hi') %}
        {% set closed = false %}
    {% endif %}

{% endfor %}

{% if closed %}
    &lt;h3&gt;The center is CLOSED&lt;/h3&gt;
{% else %}
    &lt;h3&gt;The center is OPEN&lt;/h3&gt;
{% endif %}