Shopify shipping logic with liquid dates example

liquid

{%- comment -%}
  Shopify uses RUBY, so we will too.
  For help - Ruby Date Format (strftime) Cheat Sheet: 
  http://www.strfti.me
{%- endcomment -%}

{% comment %}
Below you'll find the liquid logic for a store that has 3 day shipping, and ships 7 days a week
{% endcomment %}
{%- assign date_format = "%A, %B %d" -%}
<p>Planned ship date is: {{'now' | date: "%s" | plus : 259200 | date: date_format }}.</p>

{% comment %}
Below you'll find the liquid logic for a store that has 2 *business day* shipping and doesn't ship on the weekends (only ships Monday - Friday).
//
Shipping Calendar:
Thur = Mon
Fri = Tue
Sat = Wed
Sun = Tue
Mon = Wed
Tue = Thur
Wed = Fri
//
{% endcomment %}
{%- assign date_format = "%A, %B %d" -%}
{%- assign todayDate = 'now' | date: "%w" -%}
<p>Shipping starts at just $3.50! Planned ship date is: &nbsp;
  {%- unless todayDate == "4" or todayDate == "5" or todayDate == "6" -%}
    {%- comment -%} If today is Thur(4), Fri(5), Sat(6) = 4 days out because it ships two business days later {%- endcomment -%}
    {{'now' | date: "%s" | plus : 345600 | date: date_format }}.
  {%- else -%}
    {%- comment -%} If today is Sun(0), Mon(1), Tue(2), Wed(3) = 2 days out {%- endcomment -%}
    {{'now' | date: "%s" | plus : 172800 | date: date_format }}.
  {% endunless %}
</p>