convertTimestampToDateStr.js

const convertTimestampToDateStr = timestamp => {
    let d = new Date(timestamp),
    yyyy = d.getFullYear(),
    mm = ('0' + (d.getMonth() + 1)).slice(-2),
    dd = ('0' + d.getDate()).slice(-2),
    hh = d.getHours(),
    h = hh,
    min = ('0' + d.getMinutes()).slice(-2),
    ampm = 'AM';

    if (hh > 12) {
        h = hh - 12;
        ampm = 'PM';
    } else if (hh === 12) {
        h = 12;
        ampm = 'PM';
    } else if (hh == 0) {
        h = 12;
    }

    //// EX: 2019-05-06 22:17 PM
    return yyyy + '-' + mm + '-' + dd + ' ' + h + ':' + min + ' ' + ampm;
}