This is the brute-force method. It also removes the configuration of the repository.

Step 1: remove all history

rm -rf .git

Use custom twig template or alter an existence.

Create a custom module then use hook_theme()

Those are three functions allow you to determine the nature of a variable, with a bit different.

Comparison table

There are several methodes.

Change date format Using custom module.

For that, regenerate locals and setup locale settings.

Generate locals

Ex:# locale-gen en_US.UTF-8

Or :# locale-gen fr_FR.UTF-8

An also you can use # localedef -i en_US -f UTF-8 en_US.UTF-8