How do I convert yyyy-mm-ddT00:00:00.000Z format to Dateatime in javascript? code example

Example 1: javascript format date yyyy-mm-dd

let today = new Date()
today.toISOString().split('T')[0]

Example 2: convert date format from yyyy-mm-dd to dd-mm-yyyy using value javascript

date.value.split("-").reverse().join("-");      //"2021-01-17" --> 17-01-2021

Example 3: javascript format date yyyy-mm-dd to dd-mm-yyyy

dateString = '2020-04-03 20:30:55';

function formatDate(dateString)
    {
        var allDate = dateString.split(' ');
        var thisDate = allDate[0].split('-');
        var thisTime = allDate[1].split(':');
        var newDate = [thisDate[2],thisDate[1],thisDate[0] ].join("-");

        var suffix = thisTime[0] >= 12 ? "PM":"AM";
        var hour = thisTime[0] > 12 ? thisTime[0] - 12 : thisTime[0];
        var hour =hour < 10 ? "0" + hour : hour;
        var min = thisTime[1] ;
        var sec = thisTime[2] ;
        var newTime = hour + ':' + min + suffix;

        return newDate + ' ' + newTime;
    }