Convert Epoch time to human readable with specific

Question

To convert epoch dateTime to human readable , using a simple new date(1495159447834) will suffice.

The problem I'm encountering now is that for my hybrid application, if the user set the time-zone in his phone date time setting to lets say GMT +12:00 ,the human readable dateTime will be different from what I would want the user to have and I would want him/her to follow the server timezone.

Thus , how would I convert the epoch number to a specific given timezone in a human readable format.

I have tried example like:

var test= new Date('1495159447834 GMT+0800').toString();

and it returns me an Invalid Date.

If possible, I would want this without any libraries. I have looked through the answers here and I believe that I could not find any answers I'm looking for. If there is any previously answered question with the same topic, do let me know and I will close this question!

Answer 1

there are number of ways to convert between Epoch and Human readable format

//Convert epoch to human readable date
var myDate = new Date( 1533132667*1000);
document.write(myDate.toGMTString()+"<hr>"+myDate.toLocaleString());

//this will return Wed, 01 Aug 2018 14:11:07 GMT

  //Convert human readable dates to epoch
var myDate = new Date("Wed Aug 01 2018 14:11:07 GMT"); 
var myEpoch = myDate.getTime()/1000.0;

// this will return 1533132667

For Reference: https://www.epochconverter.com/programming/#javascript

Edit# added a JSFiddle here

Answer 2

set the initial date to the epoch and add UTC units. Say you have a UTC epoch var stored in seconds. How about 1234567890. To convert that to a proper date in the local time zone:

var utcSeconds = 1234567890;
var d = new Date(0); // The 0 there is the key, which sets the date to 
the epoch
d.setUTCSeconds(utcSeconds);

Or you can use momentjs

moment.unix(yourUnixEpochTime).format('dddd, MMMM Do, YYYY h:mm:ss A')

or you can use this way

var dateVal ="/Date(1342709595000)/";
var date = new Date(parseFloat(dateVal.substr(6)));
document.write( 
    (date.getMonth() + 1) + "/" +
    date.getDate() + "/" +
    date.getFullYear() + " " +
    date.getHours() + ":" +
    date.getMinutes() + ":" +
    date.getSeconds()
);

Answer 3

You can use offset to convert your current datetime to a specific timezone.

function convertEpochToSpecificTimezone(offset){
    var d = new Date(1495159447834);
    var utc = d.getTime() + (d.getTimezoneOffset() * 60000);  //This converts to UTC 00:00
    var nd = new Date(utc + (3600000*offset));
    return nd.toLocaleString();
}

The offset will be your specific timezone. Example: GMT +03:00, your offset is +3. If GMT -10:00, offset is -10