How to write a date in ISO 8601 type

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I’m doing a communication program with Apis online and I’m using a header like DateTime and I needed that date to stay on the ISO 8601 how can I do this ?

I’m using this to create the header :

var tempo = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ");
var httpWebRequest = (HttpWebRequest)WebRequest.Create("teste");
httpWebRequest.Headers.Add("Date"+ tempo);

The output is this:

Date 2017-09-08T15:25:53Z

I wish it was this:

Date: 2017-09-08T15:25:53Z

c# .net datetime

  • I edited the answer, what you wanted was something else.

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3 answers

3

DateTime.UtcNow.ToString("o");

or

DateTime.UtcNow.ToString("yyyy-MM-ddTHH\\:mm\\:ss.fffffffzzz");

Source.

Documentation.

This is a form of representation of a text in the specified format. A DateTime has no format, is a date is ready, only texts have format. By the question, including the edition, what you want is a text with the representation and not the date itself which is a quantitative number.

In fact the question is chameleon, what you really want is not the date in ISO format but build the text correctly, so:

httpWebRequest.Headers.Add($"Date: {DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ")}");

Behold working in the ideone. And in the .NET Fiddle. Also put on the Github for future reference.

  • how can I use this in order to stay in Datetime ?

  • 1

    @Pedroazevedo I edited the answer to show you that this doesn’t make sense.

  • received the following error: System.Argumentexception: 'The 'Date' header has to be modified with the proper property or method.'

  • This is already another mistake, you are greatly modifying what was asked, open another question about this.

  • is an error regarding what you posted in the reply

  • No, your question was about the date format, this was answered and I demonstrated in the answer (until running) that it is as you specified in the question, now you have a problem with the request. This is another completely different problem.

  • thank you very much in the same I will make another question

Show 2 more comments

2

Option 1:

DateTime.UtcNow.ToString("o");

Option 2:

DateTime.UtcNow.ToString("yyyy-MM-ddTHH\\:mm\\:ss.fffffffzzz");

Option 3 (with the specified used format):

DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ");

Reference

  • how can I use this in order to stay in Datetime ?

  • ISO 8601 is a default display (a date writing format), not a "value" itself. The closest you can get to staying in Datetime is DateTime.UtcNow and at the time the date is displayed, call the ToString equal to the answer.

0

var tempo = DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ssZ");
var httpWebRequest = (HttpWebRequest)WebRequest.Create("teste");
httpWebRequest.Headers.Add("Date: "+ tempo);

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