Round moment.js object time to nearest interval

dateRounding.js

// Ref: https://stackoverflow.com/a/25323966/8271526

function dateRounding(interval, unit, date) {
  const start = moment(date);
  const remainder = interval - (start.get(unit) % interval);
 
  const dateTime = moment(start).add(remainder, unit).format("DD.MM.YYYY, h:mm:ss a");
  return dateTime;
}

dateRounding(30, "minute", "2018-12-08 09:42");