Filter to adjust the format of the date as exported in the Orders CSV file.

apply_filters( 'pmpro_order_list_csv_dateformat', $dateformat );

Parameters

$dateformat

string; The PHP date format to apply to the order dates in the export

Source

File: https://github.com/strangerstudios/paid-memberships-pro/blob/master/adminpages/orders-csv.php