// `date` is a `Date` object const formatYmd = date => date.toISOString().slice(0, 10); // Example formatYmd(new Date()); // 2020-05-06
DateParts = data.split("/"); new Date(+DateParts[2], DateParts[1] - 1, +DateParts[0]).setUTCHours( 0, 0, 0, 0 )