Function to Convert Timestamp to Human Date in JavaScript

Convert a Unix timestamp to time in JavaScript

let unix_timestamp = 1549312452// Create a new JavaScript Date object based on the timestamp// multiplied by 1000 so that the argument is in milliseconds, not seconds.var date = new Date(unix_timestamp * 1000);// Hours part from the timestampvar hours = date.getHours();// Minutes part from the timestampvar minutes = "0" + date.getMinutes();// Seconds part from the timestampvar seconds = "0" + date.getSeconds();
// Will display time in 10:30:23 formatvar formattedTime = hours + ':' + minutes.substr(-2) + ':' + seconds.substr(-2);
console.log(formattedTime);

Javascript: Convert timestamp to human readable date?

You can use the Number data type instead of date * 1000 to achieve this. See code example below:

// generate a timestamp
var timestamp = Number(new Date()) //1479895361931

Then

// get the date representation from the timestamp
var date = new Date(timestamp) // Wed Nov 23 2016 18:03:25 GMT+0800 (WITA)

Convert timestamp to a specific date format in javascript

How you can convert /Date(1231110000000)/ to DD/MM/YYYY format :

function convert(timestamp) {  var date = new Date(                          // Convert to date    parseInt(                                   // Convert to integer      timestamp.split("(")[1]                   // Take only the part right of the "("    )  );  return [    ("0" + date.getDate()).slice(-2),           // Get day and pad it with zeroes    ("0" + (date.getMonth()+1)).slice(-2),      // Get month and pad it with zeroes    date.getFullYear()                          // Get full year  ].join('/');                                  // Glue the pieces together}

console.log(convert("/Date(1231110000000)/"));

Timestamp to human readable format

getDay() returns the day of the week. To get the date, use date.getDate(). getMonth() retrieves the month, but month is zero based, so using getMonth() + 1 should give you the right month. Time value seems to be ok here, albeit the hour is 23 here (GMT+1). If you want universal values, add UTC to the methods (e.g. date.getUTCFullYear(), date.getUTCHours())

const timestamp = 1301090400;
const date = new Date(timestamp * 1000);
const datevalues = [
   date.getFullYear(),
   date.getMonth()+1,
   date.getDate(),
   date.getHours(),
   date.getMinutes(),
   date.getSeconds(),
];
alert(datevalues); //=> [2011, 3, 25, 23, 0, 0]

Here is a small helper idea to retrieve values of a given Date:

const dateHelper = dateHelperFactory();
const formatMe = date => {
  const vals = `yyyy,mm,dd,hh,mmi,ss,mms`.split(`,`);
  const myDate = dateHelper(date).toArr(...vals);
  return `${myDate.slice(0, 3).join(`/`)} ${
    myDate.slice(3, 6).join(`:`)}.${
    myDate.slice(-1)[0]}`;
};

// to a formatted date with zero padded values
console.log(formatMe(new Date(1301090400 * 1000)));

// the raw values
console.log(dateHelper(new Date(1301090400 * 1000)).values);

function dateHelperFactory() {
  const padZero = (val, len = 2) => `${val}`.padStart(len, `0`);
  const setValues = date => {
    let vals = {
       yyyy: date.getFullYear(),
       m: date.getMonth()+1,
       d: date.getDate(),
       h: date.getHours(),
       mi: date.getMinutes(),
       s: date.getSeconds(),
       ms: date.getMilliseconds(), };
    Object.keys(vals).filter(k => k !== `yyyy`).forEach(k => 
      vals[k[0]+k] = padZero(vals[k], k === `ms` && 3 || 2) );
    return vals;
  };
  
  return date => ( {
    values: setValues(date),
    toArr(...items) { return items.map(i => this.values[i]); },
  } );
}

.as-console-wrapper {
    max-height: 100% !important;
}

How to convert unix timestamp to calendar date moment.js

Using moment.js as you asked, there is a unix method that accepts unix timestamps in seconds:

var dateString = moment.unix(value).format("MM/DD/YYYY");

How do I convert a Firestore date/Timestamp to a JS Date()?

The constructor for a JavaScript's Date doesn't know anything about Firestore's Timestamp objects — it doesn't know what to do with them.

If you want to convert a Timestamp to a Date, use the toDate() method on the Timestamp.

Convert UNIX timestamp to date time (javascript)

You have to multiply by 1000 as JavaScript counts in milliseconds since epoch (which is 01/01/1970), not seconds :

var d = new Date(timestamp*1000);

Reference

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