Solved

DateTime 01/01/0001

Posted on 2016-08-09
7
89 Views
Last Modified: 2016-08-09
hi experts

this variable model.fec_obs_concal contains the value: 01/01/0001 when not selected date,
the value could be null or empty


public DateTime fec_obs_concal { get; set; }

public DateTime concal_fecha { get; set; }
fecha01010001.png
0
Comment
Question by:enrique_aeo
  • 2
  • 2
  • 2
  • +1
7 Comments
 
LVL 70

Expert Comment

by:Éric Moreau
ID: 41749004
and your question is?
0
 
LVL 26

Accepted Solution

by:
Shaun Kline earned 500 total points
ID: 41749006
If you need the variable to allow for null, use a Nullable DateTime declaration:

public DateTime? fec_obs_concal { get; set; }
0
 

Author Comment

by:enrique_aeo
ID: 41749015
i do
public DateTime? fec_obs_concal { get; set; }

i have this error:
CS0266 C# Cannot implicitly convert type 'System.DateTime?' to 'System.DateTime'. An explicit conversion exists (are you missing a cast?)
0
Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

 
LVL 70

Expert Comment

by:Éric Moreau
ID: 41749022
have you tried Shaun comment?
0
 
LVL 26

Expert Comment

by:Shaun Kline
ID: 41749025
Did you also change the definition of concal_fecha to be a Nullable DateTime?

You will need to look through your code for other places where dates will need to allow nulls and make the needed changes.
0
 

Author Closing Comment

by:enrique_aeo
ID: 41749039
thanks

I made the change throughout the project
0
 
LVL 33

Expert Comment

by:it_saige
ID: 41749058
Date's cannot be empty.  The default value (which equates to the DateTime.Min value) is '01/01/0001 12:00 AM'.  Proof of concept -
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace EE_Q28962384
{
	class Program
	{
		static DateTime date1;

		static void Main(string[] args)
		{
			Console.WriteLine("Date1 = {0}", date1);
			Console.WriteLine("Default DateTime = {0}", default(DateTime));
			Console.WriteLine("DateTime.Min = {0}", DateTime.MinValue);
			Console.ReadLine();
		}
	}
}

Open in new window

Produces the following output -Capture.JPGIf you try to parse an empty string you end up with -Capture.JPGWhich means you are left with using a try...catch or DateTime.TryParse.  If the parse fails, the output is still the MinValue.  Proof of concept:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace EE_Q28962384
{
	class Program
	{
		static DateTime date1;

		static void Main(string[] args)
		{
			Console.WriteLine("Date1 = {0}", date1);
			Console.WriteLine("Default DateTime = {0}", default(DateTime));
			Console.WriteLine("DateTime.Min = {0}", DateTime.MinValue);
			if (DateTime.TryParse("", out date1))
				Console.WriteLine("Date1 has changed successfully - {0}", date1);
			else
				Console.WriteLine("Date1 failed to changed, MinValue assigned - {0}", date1);
			Console.ReadLine();
		}
	}
}

Open in new window

Which produces the following output -Capture.JPG
Just an FYI, trying to parse a null value results in the MinValue being set for the date.

That being said, as the others have stated you can add Null support to the DateTime variable by specifying a Nullable<DateTime> or DateTime?.  This will allow for you to support null values for Dates, but remember, that DateTime's cannot be empty.

-saige-
0

Featured Post

Master Your Team's Linux and Cloud Stack!

The average business loses $13.5M per year to ineffective training (per 1,000 employees). Keep ahead of the competition and combine in-person quality with online cost and flexibility by training with Linux Academy.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Just a quick little trick I learned recently.  Now that I'm using jQuery with abandon in my asp.net applications, I have grown tired of the following syntax:      (CODE) I suppose it just offends my sense of decency to put inline VBScript on a…
The article shows the basic steps of integrating an HTML theme template into an ASP.NET MVC project
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…

805 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question