plugin-republic/wc-order-query.php

## wc-order-query.php
<?php
$args = array(
  'limit'           => 9999,
  'return'          => 'ids',
  'date_completed'  => '2018-10-01...2018-10-10',
  'status'          => 'completed'
);
$query = new WC_Order_Query( $args );
$orders = $query->get_orders();
foreach( $orders as $order_id ) {
  // ...
}
	<?php
	$args = array(
	'limit' => 9999,
	'return' => 'ids',
	'date_completed' => '2018-10-01...2018-10-10',
	'status' => 'completed'
	);
	$query = new WC_Order_Query( $args );
	$orders = $query->get_orders();
	foreach( $orders as $order_id ) {
	// ...
	}