RCP_Member::get_joined_date PHP Method

    public function get_joined_date($subscription_id = 0)
    {
        if (empty($subscription_id)) {
            $subscription_id = $this->get_subscription_id();
        }
        $date = get_user_meta($this->ID, 'rcp_joined_date_' . $subscription_id, true);
        // Joined dates were not stored until RCP 2.6. For older accounts, look up first payment record.
        if (empty($date)) {
            $sub_name = rcp_get_subscription_name($subscription_id);
            $args = array('user_id' => $this->ID, 'subscription' => $sub_name, 'order' => 'ASC', 'number' => 1);
            $payments = new RCP_Payments();
            $payments = $payments->get_payments($args);
            if ($payments) {
                $payment = reset($payments);
                $date = $payment->date;
                $this->set_joined_date($date, $subscription_id);
            }
        }
        return apply_filters('rcp_get_joined_date', $date, $this->ID, $subscription_id, $this);
    }

/**
 * Prevents the "Cancel your subscription" link from showing
 * until the member has been subscribed to his or her current
 * subscription for 3 months.
 */
function jp_rcp_member_can_cancel($ret, $user_id)
{
    global $rcp_options;
    // Only do this on the Account Page
    if (empty($rcp_options['account_page']) || !is_page($rcp_options['account_page'])) {
        return $ret;
    }
    // Return early if other conditions aren't already met.
    if (!$ret) {
        return false;
    }
    $timezone = get_option('timezone_string');
    $timezone = !empty($timezone) ? $timezone : 'UTC';
    $member = new RCP_Member($user_id);
    $cancel_date = new \DateTime($member->get_joined_date(), new \DateTimeZone($timezone));
    $cancel_date->modify('+3 months');
    // change this if you want a different time period
    $now = new \DateTime('now', new \DateTimeZone($timezone));
    if ($ret && $now < $cancel_date) {
        $ret = false;
    }
    return $ret;
}