So just to be sure.
You’ve used our custom field column with type set to ‘Date’?
When the actual value is of the meta field is a timestamp, I expect the display value should work without any problem. But when your value is stored as ‘d/m/Y H:i:s’ I suspect it will not work as intended.
The best format for in the database in my opinion is a timestamp or ‘Y-m-d H:i:s’ format. Both formats can also be used natively to sort and filter in the database, so not only for Admin Columns but probably other features as well, I recommend to use one of those.

But if the timestamp is not working as expected, I’m curious why it doesn’t work. Can you contact me at support@admincolumns.com and send me a screenshot of your column settings for this specific column you’ve setup?

The issue here was that the date value was a unix timestamp. Admin Columns Pro uses the ‘yyyy-mm-dd hh:ii:ss’ format as its default. To change it to unix timestamp use this code snippet:

function acp_set_custom_field_stored_date_format( $date_format, ACP\Column\CustomField $column ) {

	if ( 'my_date_meta_key' === $column->get_meta_key() ) {

		// Set the date format to 'U' Unix timestamp
		$date_format = 'U';
	}

	return $date_format;
}

add_filter( 'acp/custom_field/stored_date_format', 'acp_set_custom_field_stored_date_format', 10, 2 );