Date validation in ASP.NET MVC with DataAnnotations in ViewModel

Question

I have a DateTime property in my page's ViewModel. I would like to know if there is a built-in way of checking that the user entered a valid date.

Here is what my current code looks like and as of now it is not automatically making sure the user enters a valid date (there is only required validation):

ViewModel property:

[Required]
[DataType(DataType.Date)]
public DateTime MyDate{ get; set; }

Razor MVC6 view:

<label asp-for="MyDate" class="control-label"></label>
<input asp-for="MyDate" class="form-control" />
<span asp-validation-for="MyDate" class="text-danger" />

What do you mean by not automatically making sure the user enters a valid date? What is invalid: the format or is it out of range? What input are you entering and what happens then? What do you expect to happen? — Jasen
– Jasen, Commented Feb 3, 2016 at 17:28

RJ Cuthbertson · Accepted Answer · 2016-02-03 19:29:22Z

8

If you make the DateTime nullable in your view model, this will work as you expect:

[Required]
[DataType(DataType.Date)]
public DateTime? MyDate { get; set; }

edited Feb 3, 2016 at 19:29

answered Feb 3, 2016 at 17:01

RJ Cuthbertson

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1 Comment

Axel Samyn Over a year ago

Does that work when applied on a string type ? (to ensure string has valid Date format)

Grizzly · Accepted Answer · 2016-02-03 17:22:45Z

5

[Required]
[DataType(DataType.Date)]
public Nullable<System.DateTime> MyDate { get; set; }

should work

answered Feb 3, 2016 at 17:22

Grizzly

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1 Comment

Grizzly Over a year ago

same as what @RJCuthbertson said just a different way to write it

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