ISODate in javascript code example

Example 1: date().toisostring().slice(0 10) giving wrong result

//Add Z in the end for getting the correct value with local timezone
var a = new Date("June 08, 2018 Z");
var res = a.toISOString().slice(0, 10);
console.log(res);

Example 2: js toisostring

new Date().toISOString().slice(0, 16).replace('T', ' ')
 // "2020-11-28 00:40"