Adds a "Member Since:" field to the WP admin profile.

member_since_profile_field.php

<?php

// Copy from below here...

/**
 * Adds a "Member Since:" field to the WP admin profile.
 * 
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_member_since_profile_field( $user ) {
	?>
	<table class="form-table">
		<tr>
			<th>Member Since: </th>
			<td><?php echo esc_html( date_i18n( "Y-m-d H:i:s", strtotime( $user->user_registered ) ) ); ?></td>
		</tr>
	</table>
	<?php
}
add_action( 'pmpro_after_membership_level_profile_fields', 'my_pmpro_member_since_profile_field', 5, 1 );