Using Moment.js I can't transform a correct moment object to a date object with timezones. I can't get the correct date.
Example:
var oldDate = new Date(),
momentObj = moment(oldDate).tz("MST7MDT"),
newDate = momentObj.toDate();
console.log("start date " + oldDate)
console.log("Format from moment with offset " + momentObj.format())
console.log("Format from moment without offset " + momentObj.utc().format())
console.log("(Date object) Time with offset " + newDate)
console.log("(Date object) Time without offset "+ moment.utc(newDate).toDate())
(Date object) Time with offset Thu Aug 01 2013 15:23:49 GMT+0300 (Финляндия (лето))
But timezone must be MST7MDT
Wednesday 24th 2019, 12:47:48 am
is this possible to convert into 2019-04-23T19:17:48.000Z
? @vadim.zhiltsov
.tz("MST7MDT")
. That's why libraries like moment.tz exist, to supplement the bare bones capability of the built–in Date object which only understands UTC and the host timezone, that's it.
Use this to transform a moment object into a date object:
From http://momentjs.com/docs/#/displaying/as-javascript-date/
moment().toDate();
Yields:
Tue Nov 04 2014 14:04:01 GMT-0600 (CST)
As long as you have initialized moment-timezone with the data for the zones you want, your code works as expected.
You are correctly converting the moment to the time zone, which is reflected in the second line of output from momentObj.format()
.
Switching to UTC doesn't just drop the offset, it changes back to the UTC time zone. If you're going to do that, you don't need the original .tz()
call at all. You could just do moment.utc()
.
Perhaps you are just trying to change the output format string? If so, just specify the parameters you want to the format
method:
momentObj.format("YYYY-MM-DD HH:mm:ss")
Regarding the last to lines of your code - when you go back to a Date
object using toDate()
, you are giving up the behavior of moment.js and going back to JavaScript's behavior. A JavaScript Date
object will always be printed in the local time zone of the computer it's running on. There's nothing moment.js can do about that.
A couple of other little things:
While the moment constructor can take a Date, it is usually best to not use one. For "now", don't use moment(new Date()). Instead, just use moment(). Both will work but it's unnecessarily redundant. If you are parsing from a string, pass that string directly into moment. Don't try to parse it to a Date first. You will find moment's parser to be much more reliable.
Time Zones like MST7MDT are there for backwards compatibility reasons. They stem from POSIX style time zones, and only a few of them are in the TZDB data. Unless absolutely necessary, you should use a key such as America/Denver.
.toDate()
. 2) Don't use comments to ask new questions. That's what the big "Ask Question" button is for.
.toDate
did not really work for me, So, Here is what i did :
futureStartAtDate = new Date(moment().locale("en").add(1, 'd').format("MMM DD, YYYY HH:MM"))
hope this helps
moment().add(1, 'd').toDate()
.
Since momentjs has no control over javascript date object I found a work around to this.
const currentTime = new Date(); const convertTime = moment(currentTime).tz(timezone).format("YYYY-MM-DD HH:mm:ss"); const convertTimeObject = new Date(convertTime);
This will give you a javascript date object with the converted time
The question is a little obscure. I ll do my best to explain this. First you should understand how to use moment-timezone. According to this answer here TypeError: moment().tz is not a function, you have to import moment from moment-timezone instead of the default moment (ofcourse you will have to npm install moment-timezone first!). For the sake of clarity,
const moment=require('moment-timezone')//import from moment-timezone
Now in order to use the timezone feature, use moment.tz("date_string/moment()","time_zone") (visit https://momentjs.com/timezone/ for more details). This function will return a moment object with a particular time zone. For the sake of clarity,
var newYork= moment.tz("2014-06-01 12:00", "America/New_York");/*this code will consider NewYork as the timezone.*/
Now when you try to convert newYork (the moment object) with moment's toDate() (ISO 8601 format conversion) you will get the time of Greenwich,UK. For more details, go through this article https://www.nhc.noaa.gov/aboututc.shtml, about UTC. However if you just want your local time in this format (New York time, according to this example), just add the method .utc(true) ,with the arg true, to your moment object. For the sake of clarity,
newYork.toDate()//will give you the Greenwich ,UK, time.
newYork.utc(true).toDate()//will give you the local time. according to the moment.tz method arg we specified above, it is 12:00.you can ofcourse change this by using moment()
In short, moment.tz considers the time zone you specify and compares your local time with the time in Greenwich to give you a result. I hope this was useful.
moment().tz("Asia/Shanghai").utc(true).toDate()
. It will give the date, for example, 2022-03-29T23:09:21.452Z which is a local Shanghai time.
To convert any date, for example utc:
moment( moment().utc().format( "YYYY-MM-DD HH:mm:ss" )).toDate()
moment().utc()
returns values for UTC, then .format( "YYYY-MM-DD HH:mm:ss" )
returns a string that has been set to UTC without a timezone offset so is parsed as local. It doesn't match a default moment format so is parsed by the built in parser. It doens't match any ECMAScript supported format either, so parsing is implementation dependent. Anyway, it is parsed as local so the timezone offset is applied again when creating the Date's time value.
let dateVar = moment('any date value');
let newDateVar = dateVar.utc().format();
nice and clean!!!!
I needed to have timezone information in my date string. I was originally using moment.tz(dateStr, 'America/New_York').toString();
but then I started getting errors about feeding that string back into moment.
I tried the moment.tz(dateStr, 'America/New_York').toDate();
but then I lost timezone information which I needed.
The only solution that returned a usable date string with timezone that could be fed back into moment was moment.tz(dateStr, 'America/New_York').format();
try (without format
step)
new Date(moment())
var d = moment.tz("2019-04-15 12:00", "America/New_York"); console.log( new Date(d) ); console.log( new Date(moment()) );
new Date(moment())
is equivalent to new Date()
. The timezone is only set for d.
moment has updated the js lib as of 06/2018.
var newYork = moment.tz("2014-06-01 12:00", "America/New_York");
var losAngeles = newYork.clone().tz("America/Los_Angeles");
var london = newYork.clone().tz("Europe/London");
newYork.format(); // 2014-06-01T12:00:00-04:00
losAngeles.format(); // 2014-06-01T09:00:00-07:00
london.format(); // 2014-06-01T17:00:00+01:00
if you have freedom to use Angular5+, then better use datePipe feature there than the timezone function here. I have to use moment.js because my project limits to Angular2 only.
new Date(moment()) - could give error while exporting the data column in excel
use
moment.toDate() - doesn't give error or make exported file corrupt
Success story sharing
toDate
is indeed how to get aDate
object from amoment
. But the code in the body of the question asks about time zone conversion - whichDate
cannot do. Unless Mountain time is indeed the user's time zone, then I'm not sure how this answered the question.moment("12/12/2011")
is where you would get that message. It has nothing to do with going from moment to date objmoment().toDate()