Debug liquid for Shopify

I'm really puzzled and can't understand why my {{ time }} returns an empty value.

I'm trying to calculate the difference between the time currently and a booking time in Shopify. For the booking I have the date (first line_item.property) and the time (second one) coming separately. I want to add one to another and then compare it to the current time, but before I can do the math I have tried to display the different variables I have created.{{ now }} & {{ date }} work fine but for {{ time }} it returns an empty value. On the other hand if instead of assigning it a value name I just display the line.item.property it works just fine.

Can you help me understand what I am doing wrong here?

 {% assign today = 'now' | date: '%s' %} {% for order in customer.orders %} {%- for line_item in order.line_items -%} {% for property in line_item.properties limit:1 %} {% assign date = property.last | date: '%s' %} {% endfor %} {% for property in line_item.properties offset:1 %} {% assign time = property.last | date: '%s' %} {% endfor %} {%- endfor -%} {{ now }} - {{ date }} - {{ time }} {% endfor %}

2 Answers

By using plus: 0 you can convert the string to integer, this will enable math operation for your comparison.

 {% assign today = 'now' | date: '%s' | plus: 0 %}

check with {% unless line_item.properties == empty %} to see if properties exist.

{% assign date = property.last | date: '%s' %} , the variable property.last must follow a well-formatted dates for date to work. liquid-date-format

{% for property in line_item.properties offset:1 %} {% assign time = property.last | date: '%s' %} {% endfor %}

problem with offset:1, if the array only has 1 line_item.properties this will not run at all. Hence time is empty; or it exist but property.last does not have a date format.

{% assign today = 'now' | date: '%s' | plus: 0 %}
{% for order in customer.orders %} {%- for line_item in order.line_items -%} {% unless line_item.properties == empty %} {% for property in line_item.properties %} {% if forloop.index == 1 %} {% assign date = property.last | date: '%s' | plus: 0 %} {% if date == 0 %} {% comment %}Opp! Not A Date, Terminate loop{% endcomment %} {% break %} {% endif %} {% else %} {% assign time = property.last | date: '%s' | plus: 0 %} {% unless time == 0 %} {% assign date = date - time %} {% endunless %} {% endif %} {% endfor %} {% endunless %}
{% endfor %}
{{today - date}}

Thanks Charles that really unblocked me. Posting here the final version I went with as I needed to compare exact time and not simply the date of the order.

 {% assign now_date = 'now' | date: '%s' | plus: 0 %} {% assign now_time = 'now' | date: '%s' | plus: 0 %} {% for order in customer.orders %} {%- for line_item in order.line_items -%} {% for property in line_item.properties limit:1 %} {% assign booking_date = property.last | date: '%s' | plus: 0 %} {% endfor %} {% for property in line_item.properties offset:1 limit:1 %} {% assign booking_time = property.last | date: '%s' | plus: 0 %} {% endfor %} {% assign date_to_compare = booking_date | plus: '86400' %} {% unless now_date > date_to_compare %} {% if now_time <= booking_time or now_date <= booking_date %}SEANCE A VENIR{% endif %} {% endunless %} {%- endfor -%} {% endfor %}