format YYYY-MM-DD date js code example
Example 1: javascript convert date to yyyy-mm-dd
// `date` is a `Date` object
const formatYmd = date => date.toISOString().slice(0, 10);
// Example
formatYmd(new Date()); // 2020-05-06
Example 2: javascript date parse yyyy-mm-dd
var dateString = "10/23/2015"; // Oct 23
var dateObject = new Date(dateString);
document.body.innerHTML = dateObject.toString();