Trying to format a DateTime results in a "Unknown "format_datetime"" error

Question

I have a new Symfony 6.4 web application, pretty barebone.

I'm trying to format a date using the Twig format_datetime filter:

{{ post.createdAt ? post.createdAt|format_datetime('c') : '' }}

When calling the page, I get a 500 error

Unknown "format_datetime" filter in post/index.html.twig at line 28.

I do not understand what I'm missing.

DarkBee · Accepted Answer · 2025-08-24 07:43:24Z

1

The Twig format_date filter which is related to the format_datetime filter has a note explaining we need to install 2 dependencies to use it:

composer require twig/intl-extra
composer require twig/extra-bundle

After installing it, the filter works fine.

edited Aug 24 at 7:43

DarkBee

14.5k9 gold badges83 silver badges132 bronze badges

answered Aug 23 at 20:16

LucileDT

6821 gold badge10 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Unsure why you've made that PR - The exact same note is already present inside the current documentation, as well on the website