Convert date time string to UTC date in JavaScript

Question

How can I convert "2011-09-30T00:00:00" date time string to UTC date in JavaScript?

I tried new Date("2011-09-30T00:00:00") but it converts to "2011-09-29T23:00:00.000Z".

new Date("2011-09-30T00:00:00") should not convert it to "2011-09-29T23:00:00.000Z", that happens only if you do new Date("2011-09-30T00:00:00").toISOString(). Where are you trying this? Have you tried new Date("2011-09-30T00:00:00").toUTCString()? — M3rr1
– M3rr1, Commented Sep 30, 2021 at 19:14
Thanks for your comment, I tried toUTCString but I need a date object while toUTCString returns a string. Would new Date( new Date("2011-09-30T00:00:00").toUTCString()) return a UTC date? — developer
– developer, Commented Sep 30, 2021 at 21:25

Killer · Accepted Answer · 2021-09-30 19:20:25Z

1

Simple:

function createDateUTC(dateUTC) {
    return new Date(dateUTC + "Z");
}

var dateUTC = createDateUTC("2011-09-30T00:00:00");

console.log(dateUTC);

answered Sep 30, 2021 at 19:20

Killer

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4 Comments

developer Over a year ago

Interesting! - So does adding a "Z" makes it a UTC date?

RobG Over a year ago

A good answer should explain why the OP has their issue and how your code fixes it.

RobG Over a year ago

@developer—see What are valid Date Time Strings in JavaScript? and Why does Date.parse give incorrect results?

Killer Over a year ago

Sorry for the delay but @RobG already quoted some good topics about the reason why the code worked and why the issue happened.

Jair Lopez Gutierrez · Accepted Answer · 2021-09-30 19:07:01Z

1

function createDateAsUTC(dateYmd) {
    var dateYmdSplited = dateYmd.split('-');
    var y = Number(dateYmdSplited[0]);
    var m = Number(dateYmdSplited[1]) - 1;
    var d = Number(dateYmdSplited[2])

    return new Date(Date.UTC(y, m, d, 0, 0, 0))
}

var fecha = "2021-09-01";
var d = createDateAsUTC(fecha);

answered Sep 30, 2021 at 19:07

Jair Lopez Gutierrez

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