Live article: https://www.storyblok.com/faq/how-to-create-an-rfc-822-format-in-liquid
How to create an RFC-822 format in Liquid?
The correct string format you can use with Liquid is:
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{{ "now" | date: "%a, %d %b %Y %H:%M:%S %z" }}if the following filter is not available:
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{{ "now" | date_to_rfc822 }}