MomentJS convert from UTC to desired timezone, not

I am using momentjs but having an issue trying to convert a UTC time to a specific timezone (not necessarily local to the current user) that is specified by name 'America/New_York'. This SO question is similar but didn't really help.

My thought process is to create a utc moment obj with the received date from the server and then format that UTC time to the specific timezone for display purposes. A small snippet of how I'm currently approaching this:

var cutoffString = '20170421 16:30:00'; // in utc
var utcCutoff = moment.tz(cutoffString, 'YYYYMMDD HH:mm:ss', '+00:00');
var displayCutoff = 
        moment.tz(utcCutoff.format('YYYYMMDD HH:mm:ss'), 'YYYYMMDD HH:mm:ss', 'America/New_York');

console.log('utcCutoff:', utcCutoff.format('YYYYMMDD hh:mm:ssa Z')); // => utcCutoff: 20170421 04:30:00pm +00:00
console.log('displayCutoff:', displayCutoff.format('YYYYMMDD hh:mm:ssa Z')); // => displayCutoff: 20170421 04:30:00pm +00:00

My assumption here is that displayCutoff would be the utcCutoff time displayed in 'America/New_York' time. But it currently is displays the same time as the utcCutoff object. I also should mention that using .utc() instead of .tz and trying to manipulate the timezone after applying .local() did not work either.

Any help/guidance would be appreciated.

标签： javascript momentjs

3条回答

SAY GOODBYE

2楼-- · 2019-06-25 14:00

You can use moment.utc since your input is an UTC string. You can use tz to convert your moment object to a given timezone.

Please note that the tz function converts moment object to a given zone, while you are using moment.tz parsing function that builds a new moment object with the given zone. When you do:

var displayCutoff = 
    moment.tz(utcCutoff.format('YYYYMMDD HH:mm:ss'), 'YYYYMMDD HH:mm:ss', 'America/New_York');

you are not converting utcCutoff to 'America/New_York' but you are building a new moment object for 20170421 16:30:00 in New York.

Here an updated version of your code:

var cutoffString = '20170421 16:30:00'; // in utc
var utcCutoff = moment.utc(cutoffString, 'YYYYMMDD HH:mm:ss');
var displayCutoff = utcCutoff.clone().tz('America/New_York');

console.log('utcCutoff:', utcCutoff.format('YYYYMMDD hh:mm:ssa Z')); // => utcCutoff: 20170421 04:30:00pm +00:00
console.log('displayCutoff:', displayCutoff.format('YYYYMMDD hh:mm:ssa Z')); // => displayCutoff: 20170421 12:30:00pm -04:00

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.11/moment-timezone-with-data-2010-2020.min.js"></script>

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萌系小妹纸

3楼-- · 2019-06-25 14:25

Moment timezone plugin is exactly what you need : http://momentjs.com/timezone/

var dec = moment("2014-12-01T12:00:00Z");
dec.tz('America/New_York').format('ha z');  // 5am PDT

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别忘想泡老子

4楼-- · 2019-06-25 14:25

There is no need to use MomentJs to convert your timezone to specific timezone. Just follow my given below code, it will work for you :

$(document).ready(function() {
   //EST
setInterval( function() {
var estTime = new Date();
 var currentDateTimeCentralTimeZone = new Date(estTime.toLocaleString('en-US', { timeZone: 'America/Chicago' }));
var seconds = currentDateTimeCentralTimeZone.getSeconds();
var minutes = currentDateTimeCentralTimeZone.getMinutes();
var hours =  currentDateTimeCentralTimeZone.getHours();//new Date().getHours();
 var am_pm = currentDateTimeCentralTimeZone.getHours() >= 12 ? "PM" : "AM";

if (hours < 10){
     hours = "0" + hours;
}

if (minutes < 10){
     minutes = "0" + minutes;
}
if (seconds < 10){
     seconds = "0" + seconds;
}
    var mid='PM';
    if(hours==0){ //At 00 hours we need to show 12 am
    hours=12;
    }
    else if(hours>12)
    {
    hours=hours%12;
    mid='AM';
    }
    var x3 = hours+':'+minutes+':'+seconds +' '+am_pm
// Add a leading zero to seconds value
$("#sec").html(x3);
},1000);


});

<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

</head>
<body>
<p class="date_time"><strong id="sec"></strong>  </p>


</body>
</html>

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MomentJS convert from UTC to desired timezone, not

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