Moment JS
By Moment JS is a great Javascript library for web developers to convert dates
Usage
//Local time
var m1 = new moment();
var localYear = m1.year();
var localMonth = m1.month();
var localDate = m1.date(); //Day of month
var localDay = m1.day(); //Day of week
var localHour = m1.hour();
var localMinute = m1.minute();
var localSecond = m1.second();
var isoStr = m1.toISOString();
//UTC
var mUtc = moment.utc(); //Get current UTC timestamp
var mUtc2 = moment.utc('2018-08-20T08:03:26.617Z'); //UTC timestamp string
//Convert UTC moment to user's timezone settings:
var mLoc = mUtc.local();
var localYear = mLoc.year();
var localMonth = mLoc.month();
var localDate = mLoc.date(); //Day of month
var localDay = mLoc.day(); //Day of week
var localHour = mLoc.hour();
var localMinute = mLoc.minute();
var localSecond = mLoc.second();