从时区datetime转换为短日期C＃

Question

I have datetime data that looks like this: 2018-06-29T22:10:33Z .

I need it in Short date format - 06/29/2018 ie, without the time part.

I have tried the following in C#:

ConvertToDateTime(dateString);
DateTime.Parse(dateString);

Errors with both.

I'm resorting to dateString.substring(0,10) to get the 1st 10 characters and convert that to date.

Is there a better method?

Answer 1

You can use DateTime.TryParse method. ie:

string s = "2018-06-29T22:10:33Z";
DateTime t;
if (DateTime.TryParse(s, out t))
{
    Console.WriteLine(t.ToShortDateString());
}

To get UTC date:

string s = "2018-06-29T22:10:33Z";

DateTime t;
if (DateTime.TryParse(s, out t))
{
    Console.WriteLine(t.ToUniversalTime().ToShortDateString());
}

Answer 2

First and foremost, the date format appears to be not well formatted. The format you should be receiving should like "yyyy-MM-ddTHH:mm:ss.fffffffK" (ie "2018-06-29T22:10:05.1440844Z").

Assuming there was a typo in the sample date provided, here are a couple of samples to convert the date time string (in UTC format) to a DateTime:

var dateString = "2018-06-29T22:10:05.1440844Z";

var datetime = DateTime.ParseExact(dateString, "yyyy-MM-ddTHH:mm:ss.fffffffK", CultureInfo.InvariantCulture);
var date = datetime.Date;

or

var datetime = DateTime.ParseExact(dateString, "o", CultureInfo.InvariantCulture);
var date = datetime.Date;

You have to take into consideration that you are getting a UTC date and timezone conversions must be taken into consideration. Also, when just taking the date part, the time part is set to "12:00:00 AM".