Add a join date column to the users table in wp-admin

user-join-date-column.php

<?php
/**
 * Add custom columns in Users area in the CMS
 * @param $columns
 *
 * @return mixed
 */
function doublee_manage_users_columns($columns) {
	
	$columns['join_date'] = 'Join date';

	return $columns;
}
add_filter('manage_users_columns', 'doublee_manage_users_columns');


/**
 * Populate custom columns in Users area in the CMS
 *
 * @param $output
 * @param $column_name
 * @param $user_id
 *
 * @return string
 * @throws Exception
 */
function doublee_manage_users_custom_columns($output, $column_name, $user_id) {
	$userdata = get_userdata($user_id);

	// Populate the join date column
	if($column_name == 'join_date') {
		$recorded_date = $userdata->user_registered;
		$date = new DateTime($recorded_date);
		$updated_date = $date->setTimezone(new DateTimeZone('Pacific/Auckland'));

		$output = date_format($updated_date, 'Y-m-d H:i:s');
	}

	// Populate the listing count column
	if($column_name == 'listing_count') {
		$listings = get_user_meta($user_id, 'listings', true);
		if($listings) {
			$count = count( $listings );
			$url   = admin_url().'edit.php?post_type=product&author='.$user_id;

			$output = '<a href="'.$url.'">'.$count.'</a>';
		}
	}

	return $output;
}
add_filter('manage_users_custom_column', 'doublee_manage_users_custom_columns', 10, 3);