Overriding time format string in child theme functions.php

Hi, I am working on a child theme for my domains.

Please suggest way to filter customised time format string (d M y D) for functions.php , so that I need not to change on each domain wp setting individually.

I read this also https://wordpress.org/documentation/article/customize-date-and-time-format/

if i override it in functions.php and it will save time.

Warm regards.

P.S. : I am trying it with generate_post_date_output ??? but no help