formatting Datetime string-CodePudding

i have the following object that can be nullable at times follows

public string issued {get;set;}

The issued string looks like this: 2022/02/29 22:00:00 00:00

I want to assign the issued variable to another variable as 2022/02/29 when its not null.

This is what i tried:

var item = new model() {
    issuedDate=issued.IsNullOrEmpty() ? "" : issued.ToString("yyyy/mm/dd")
}

But it throws an error:

can not convert from string to system.IformatProvider?

How can I fix this?

CodePudding user response：

I recommend using DateTime as helper with TryParseExact to determine if the source is a valid DateTime format. Via the DateTime helper variable you can then create any DateTime formatted strings you need to.

string   issued = @"2022/02/29 22:00:00  00:00";
string   issuedDate;
DateTime dateTimeIssued;

if (DateTime.TryParseExact(issued, "yyyy/MM/dd HH:mm:ss zzz", CultureInfo.InvariantCulture, DateTimeStyles.None, out dateTimeIssued)) {
  issuedDate = dateTimeIssued.ToString("yyyy/MM/dd");
}

Be aware that TryParseExact only works if the format is known to the system culture.

CodePudding user response：

you can try for format;

 string.Format("{0:yyyy/MM/dd}",issued);

this will be return 2022/02/29 for you

and you can look this page, for more information on DateTime format.

https://www.csharp-examples.net/string-format-datetime/