aMember (site.js): change absolute dates to relative in Active Subscription widget

site.js

jQuery(function(){
    jQuery('.am-list-subscriptions-date_expires_date, .am-list-subscriptions-date_rebill_date, .am-list-subscriptions-date_future_date').each(function(){
        if (jQuery(this).data('date') == '2037-12-31') return;

        const today = new Date().toISOString().slice(0, 10)
        const diffInDays = 1 + (new Date(jQuery(this).data('date')) - new Date(today)) / (1000 * 60 * 60 * 24);
        jQuery(this).attr('title', jQuery(this).html());
        jQuery(this).html(`in ${diffInDays} ${diffInDays == 1 ? 'day' : 'days'}`);
    });
});