JSON.NET: Get Specific JSON Date Value

Question

In my VB.NET project, using JSON.NET, I\'ve got a JSON from a Web API that has a value representing a date in the yyyy-MM-ddTHH:mm:ss format, and I\'d like to s

Answer 1

When you get the parsed date-string from JSON.NET it will be in your culture's format as shown in your code comment:

Dim temp As String = myJsonResult("REQ_DATE")
' temp = "1/17/2016 12:27:57 PM"

That format is "M/d/yyyy HH:mm:ss tt" so use that format for parsing. But since it is in a format for your culture, you can let DateTime check/use all the known formats using TryParse:

Dim dt As DateTime
Dim temp As String = jobj("REQ_DATE").ToString

If DateTime.TryParse(temp, dt) Then
    'dt is good to use!
    Console.WriteLine(dt.ToString)
    ' Prints: 1/17/2016 12:27:57 PM
End If

Dim myDesiredResult As String = dt.ToString("yyyy-MM-ddTHH:mm:ss")
' result: "2016-01-17T12:27:57"

If you want to specify the format (it would be better to use TryParseExact):

dt = DateTime.ParseExact(temp, "M/d/yyyy HH:mm:ss tt",
         CultureInfo.InvariantCulture)
Console.WriteLine(dt.ToString())
' Also prints: 1/17/2016 12:27:57 PM

Dates dont have a format, so it cant change, but it may display differently for your culture settings. You can display it any way you want, it is still the same date:

Console.WriteLine(dt.ToString("HH yyyy MM mm dd"))
Console.WriteLine(dt.ToString("yyyy-MM-ddTHH:mm:ss"))
Console.WriteLine(dt.ToString("MM/d/yyyy HH:mm:ss tt"))