How to prevent duplicate blog post dates in shopify - date

Question

I have a blog with posts on a shopify website. I want to get all the publication dates of posts, and I do it like this:
{% for article in blog.articles %}
{{ article.created_at }}
{% endfor %}
And this is the output result:
2022-02-01 14:50:06
2022-01-25 05:25:33
2022-01-25 05:24:48
The result shows that there are two posts with the date 2022-01-25 and one post with the date 2022-02-01. But all these dates have different seconds and minutes.
I want to remove seconds and minutes by setting the format to date: "%B %Y":
{{ article.created_at | date: "%B %Y" }}
And in the end I get this result:
February 2022
January 2022
January 2022
Now the question is: How do I prevent duplicate dates with the same format date: "%B %Y"?
I can easily solve this problem with javascript, but I want to know if it's possible to solve this problem using only shopify features.
I will be glad to any answer. Thanks!

Answer 1

You can store all the dates in as string
{%- capture dates -%}
{%- for article in blog.articles -%}
{{ article.created_at | date: "%B %Y" }},
{%- endfor -%}
{%- endcapture -%}
And split and uniq the values to get only the unique ones:
{% assign unique_dates = dates | split: ',' | uniq %}
This will remove any values that are repeating.
Hope this is what you are looking for.