Add a filter to the PMPro orders table to show the 30 days of orders.

my_pmpro_admin_orders_filters_past30.php

<?php
/**
 * Add a filter to the PMPro orders table
 * in the WordPress dashboard
 * to show the past 30 days of orders.
 * Requires PMPro 2.3 or higher.
 * Add this code through a Code Snippet or Custom Plugin.
 */
// Add the filter.
function my_pmpro_admin_orders_filters_past30( $filters ) {
	$filters['past30'] = 'Past 30 Days';
	return $filters;
}
add_filter( 'pmpro_admin_orders_filters', 'my_pmpro_admin_orders_filters_past30' );

// Adjust SQL based on filter.
function my_pmpro_admin_orders_query_condition_past30( $condition, $filter ) {
	if ( $filter == 'past30' ) {
		$now = current_time( 'timestamp' );
		$start_date = date( 'Y-m-d', strtotime( '-30 days', $now ) );
		$end_date = date( 'Y-m-d', $now );
		$condition = "o.timestamp BETWEEN '" . esc_sql( $start_date ) . "' AND '" . esc_sql( $end_date ) . "'";
	}
	
	return $condition;
}
add_filter( 'pmpro_admin_orders_query_condition', 'my_pmpro_admin_orders_query_condition_past30', 10, 2 );