如何更改datepicker格式？

Question

I'm using Option Tree plugin for add more metaboxes to my site, i'm using date-picker, but the format is in yy-mm-dd

Option Tree have filter to change this:

/* filter date format */
$date_format = apply_filters( 'ot_type_date_picker_date_format', 'yy-mm-dd', $field_id );

But i not understand how to apply new filter to override this in my functions.php file.

add_filter( 'ot_type_date_picker_date_format', 'dd-mm-yy', $field_id );

This not work for me :(

Answer 1

WordPress filters work with function callbacks.

apply_filters calls the hooks defined for the tag 'ot_type_date_picker_date_format' (first argument) with as arguments 'yy-mm-dd' and $field_id. Thus, the add_filter should probably look something like this:

add_filter('ot_type_date_picker_date_format', function($format, $field_id) {
   return 'dd-mm-yy';
});

-- edit -- after a quick Google search, this gist might be of more help