asp.net mvc 3 - Greater Than or Equal To Today Date validation annotation in MVC3

Question

Has anyone seen an MVC3 data annotation for Date validation that requires a single selected date to be equal to or greater than current date?

If there's already a third party add on that's cool too. I'm already using the DataAnnotationsExtensions but it doesn't offer what I'm looking for.

There doesn't seem to be any reference of this on. So, hoping someone has already solved this before I try to reinvent the wheel and write my own custom validator.

I've tried Range but that requires 2 dates and both have to be constants in string format such as [Range(typeof(DateTime), "1/1/2011", "1/1/2016")] but that doesn't help. And the DataAnnotationsExtensions Min validator only accepts int and double

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Update Solved

Thanks to @BuildStarted this is what I ended up with and it works great server-side and now client side with my script

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using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Web.Mvc;

namespace Web.Models.Validation {

    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public sealed class DateMustBeEqualOrGreaterThanCurrentDateValidation : ValidationAttribute, IClientValidatable {

        private const string DefaultErrorMessage = "Date selected {0} must be on or after today";

        public DateMustBeEqualOrGreaterThanCurrentDateValidation()
            : base(DefaultErrorMessage) {
        }

        public override string FormatErrorMessage(string name) {
            return string.Format(DefaultErrorMessage, name);
        }  

        protected override ValidationResult IsValid(object value, ValidationContext validationContext) {
            var dateEntered = (DateTime)value;
            if (dateEntered < DateTime.Today) {
                var message = FormatErrorMessage(dateEntered.ToShortDateString());
                return new ValidationResult(message);
            }
            return null;
        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context) {
            var rule = new ModelClientCustomDateValidationRule(FormatErrorMessage(metadata.DisplayName));
            yield return rule;
       }
    }

    public sealed class ModelClientCustomDateValidationRule : ModelClientValidationRule {

        public ModelClientCustomDateValidationRule(string errorMessage) {
            ErrorMessage = errorMessage;
            ValidationType = "datemustbeequalorgreaterthancurrentdate";
        }
    }
}

And in my model

[Required]
[DateMustBeEqualOrGreaterThanCurrentDate]
public DateTime SomeDate { get; set; }

The client side script

/// <reference path="jquery-1.7.2.js" />

jQuery.validator.addMethod("datemustbeequalorgreaterthancurrentdate", function (value, element, param) {
    var someDate = $("#SomeDate").val();
    var today;
    var currentDate = new Date();
    var year = currentDate.getYear();
    var month = currentDate.getMonth() + 1;  // added +1 because javascript counts month from 0
    var day = currentDate.getDate();
    var hours = currentDate.getHours();
    var minutes = currentDate.getMinutes();
    var seconds = currentDate.getSeconds();

    today = month + '/' + day + '/' + year + '  ' + hours + '.' + minutes + '.' + seconds;

    if (someDate < today) {
        return false;
    }
    return true;
});

jQuery.validator.unobtrusive.adapters.addBool("datemustbeequalorgreaterthancurrentdate");

Answer 1

Create a custom attribute.

public class CheckDateRangeAttribute: ValidationAttribute {
    protected override ValidationResult IsValid(object value, ValidationContext validationContext) {
        DateTime dt = (DateTime)value;
        if (dt >= DateTime.UtcNow) {
            return ValidationResult.Success;
        }

        return new ValidationResult(ErrorMessage ?? "Make sure your date is >= than today");
    }

}

code was written off the cuff so fix any errors :)