<?php
add_action('em_bookings_table_cols_template', 'my_em_bookings_table_cols_template_wc_order_id',100,2);
function my_em_bookings_table_cols_template_wc_order_id($template, $EM_Bookings_Table){
	$template['booking_date'] = 'Booking Date';
	return $template;
}

add_filter('em_bookings_table_rows_col','my_em_custom_booking_form_cols_wc_order_id', 100, 5); 
function my_em_custom_booking_form_cols_wc_order_id($value, $col, $EM_Booking, $EM_Bookings_Table, $csv){
 
	if( $col == 'booking_date' ){
		$value = $EM_Booking->date()->i18n( $EM_Booking->get_option('dbem_date_format'));
	}
 
	return $value;
}