javascript - How to convert date time from ISO Format to UTC time zone? - Stack Overflow

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I am using moment.js, and I want to convert from ISO Format date time to UTC time zone.

I can convert from local time to UTC+ISOformat, but I am not able to convert ISO format to UTC time zone.

Input:

2018-03-22T00:00:00Z

Expected output:

date should be in UTC time zone. If I calculate the it should be:

22018-03-21T18:30:00Z

1. First I want to convert into ISO, After that convert into UTC**.

Not able to Converted local date time to ISO then UTC

We can convert into string, But from ISO format can convert or not?

Fox example: I want to convert ISODATE(2018-03-22T00:00:00Z) into UTC time zone.

function toISO(dt) {
  return moment(dt).format("YYYY-MM-DDTHH:mm:ss") + "Z";
}
var date = new Date();
var isoDate= toISO(date)

Direct we can convert

function toISOWithUtc(dt) {
      return moment(dt).utc().format("YYYY-MM-DDTHH:mm:ss") + "Z";
}
var date = new Date();
toISO(date)

I am using moment.js, and I want to convert from ISO Format date time to UTC time zone.

I can convert from local time to UTC+ISOformat, but I am not able to convert ISO format to UTC time zone.

Input:

2018-03-22T00:00:00Z

Expected output:

date should be in UTC time zone. If I calculate the it should be:

22018-03-21T18:30:00Z

1. First I want to convert into ISO, After that convert into UTC**.

Not able to Converted local date time to ISO then UTC

We can convert into string, But from ISO format can convert or not?

Fox example: I want to convert ISODATE(2018-03-22T00:00:00Z) into UTC time zone.

function toISO(dt) {
  return moment(dt).format("YYYY-MM-DDTHH:mm:ss") + "Z";
}
var date = new Date();
var isoDate= toISO(date)

Direct we can convert

function toISOWithUtc(dt) {
      return moment(dt).utc().format("YYYY-MM-DDTHH:mm:ss") + "Z";
}
var date = new Date();
toISO(date)

• javascript
• datetime
• momentjs
• utc
• iso8601

Share Improve this question Follow edited Mar 22, 2018 at 11:58 Brett DeWoody 62.9k3131 gold badges144144 silver badges192192 bronze badges asked Mar 22, 2018 at 10:34 Varun SharmaVarun Sharma 4,8421313 gold badges5555 silver badges105105 bronze badges 5

• Please include inputs and expected outputs for each input. – Igor Commented Mar 22, 2018 at 10:38
• @Igor convert into UTC.. 2018-03-22T00:00:00Z – Varun Sharma Commented Mar 22, 2018 at 10:39
• 1 Let me rephrase: edit your question, include inputs and corresponding expected outputs. If you really want to be helpful to those looking at the question do it as if you were writing unit tests. – Igor Commented Mar 22, 2018 at 10:40
• 1 How is 2018-03-22T00:00:00Z not in "date should be in UTC time zone"? Again, write it as if you were writing a unit test. What is the type you are checking and what should its value be? At the moment it is still very unclear what you are actually asking/needing. – Igor Commented Mar 22, 2018 at 10:50
• 2018-03-22T00:00:00Z is not a local time, the Z at the end means the timezone is UTC. – phuzi Commented Mar 22, 2018 at 12:03

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1 Answer 1

Sorted by: Reset to default 5

Both 2018-03-22T00:00:00Z and 2018-03-21T18:30:00Z already are in UTC.

Note the Z in the end? This means that the date is in UTC. It's not a hardcoded letter that you can just append to the end - it has a specific meaning, it tells that the date/time is in UTC.

If you want to convert that UTC date to another timezone (I'm guessing that's what you want), you can use moment.tz:

// convert UTC 2018-03-22T00:00:00Z to Asia/Kolkata timezone
moment.tz('2018-03-22T00:00:00Z','Asia/Kolkata')

Just change the timezone name to the one you want to convert.

And calling format() will give you the converted date/time in ISO8601 format:

moment.tz('2018-03-22T00:00:00Z','Asia/Kolkata').format() // 2018-03-22T05:30:00+05:30

Note that the offset changed from Z to +05:30. This means that the date/time above is 5 hours and 30 minutes ahead UTC, which is the result of converting 2018-03-22T00:00:00Z to Kolkata's timezone.

Note: I think you're mistaking the concepts here.

UTC is a time standard. It defines things like the current date/time accross the world, it uses atomic clocks to make sure everybody on Earth are synchronized, and timezones are all based on offsets from UTC.

ISO8601 is a standard for exchanging date/time-related data. It defines formats (text representations of dates). A date/time can be in ISO format, regardless of being in UTC or not.

That's why "convert from UTC to ISO" (or vice-versa) makes no sense at all.

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