Convert Milliseconds to yyyy-MM-dd HH:mm:ss format Javascript

Question

Input:-

milliSecond = '1519073776000';

Output:-

Date = "2018-02-20 02:26:16";

Convert Millisecond Date into yyyy-MM-dd HH:mm:ss format

Answer 1

There are two steps to your question.

Step 1: Get date from milliseconds.

This can easily be done by calling new Date(MILLISECONDS_AS_NUMBER);.

Step 2: Format a date string from the Date object.

This is a little more complicated, as there are no default method for doing this.

The best method is to create a function that takes a format string and a date and simply stack format.replace(token, Date.key) calls.

Here is an implementation of the above steps:

function toDate(date) {
  if (date === void 0) {
    return new Date(0);
  }
  if (isDate(date)) {
    return date;
  } else {
    return new Date(parseFloat(date.toString()));
  }
}

function isDate(date) {
  return (date instanceof Date);
}

function format(date, format) {
  var d = toDate(date);

  return format
    .replace(/Y/gm, d.getFullYear().toString())
    .replace(/m/gm, ('0' + (d.getMonth() + 1)).substr(-2))
    .replace(/d/gm, ('0' + (d.getDate() + 1)).substr(-2))
    .replace(/H/gm, ('0' + (d.getHours() + 0)).substr(-2))
    .replace(/i/gm, ('0' + (d.getMinutes() + 0)).substr(-2))
    .replace(/s/gm, ('0' + (d.getSeconds() + 0)).substr(-2))
    .replace(/v/gm, ('0000' + (d.getMilliseconds() % 1000)).substr(-3));
}
//TEST
var ms = '1519073776000';
var dateFormat = "Y-m-d H:i:s.v";
var formatted = format(ms, dateFormat);
console.log(formatted);

Alternatively you could opt-out of all this and use a library like MomentJS to handle this.