/Javascript/AngularJS/Angular set timezone

Angular set timezone

// PST
Date.prototype.toPSTString = function () {
  let date = this.toString();
  //date.replace.... easy part, you could use Regex to do it
  return date;
};
//iso format
Date.prototype.toPSTString = function () {
  function convertMinuteToMillisecond(mins) {
    return mins * 60 * 1000;
  }
  let localDateOffsetToUtc = this.getTimezoneOffset(); //the offset between the user local timezone with UTC. In my use case of Singapore, it give me -480.
  const offSetBetweenPSTAndUTC = 480;
  let offsetBetweenPSTAndLocal = offSetBetweenPSTAndUTC - localDateOffsetToUtc;
  let newDate = new Date(
    this.getTime() + convertMinuteToMillisecond(offsetBetweenPSTAndLocal)
  );
  return newDate.toISOString();
};

var date = new Date(2019, 3, 5);
date.toISOString(); //"2019-04-04T16:00:00.000Z" Singapore
date.toPSTString(); //"2019-04-05T08:00:00.000Z" PST

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