Error Warning During Stripe Purchase

Hi there,

I am in the process of switching to Stripe Integration and using subscriptions for the first time and I am getting a warning message in regards to my s2 hacks file. The line it is talking about is in there because with regular registrations (not subscriptions) I want the EOT date sent to Mail Chimp. I would assume this is happening because there is no EOT date with subscriptions? Thoughts on how to fix?

This is the error message I get (it’s just at the top of the screen but registration seems to work properly).

Warning: date() expects parameter 2 to be long, string given in /home/********/public_html/wp-content/mu-plugins/s2-hacks.php on line 8

And this is my s2 hacks file…

<?php
add_filter('ws_plugin__s2member_mailchimp_merge_array', 'my_filter', 10, 2);
function my_filter($merge, $vars) {
	// $merge: Array of existing MERGE fields that s2Member passes by default.
	// $vars:  Array of defined variables in the scope/context of this Filter.

	$custom_merge = array(
		'eot_date'   => date('m/d/Y',get_user_option('s2member_auto_eot_time', $vars['user_id']))
	);

	return array_merge($merge, $custom_merge);
}

/* Forces the default role of a new user to be set to "s2member Level 1" instead of "Subscriber" */
add_filter("ws_plugin__s2member_force_default_role", "default_role",10,1);
function default_role($role) {
	$return = 's2member_level1';
	return $return;
}

https://wordpress.org/plugins/s2member/