Data Annotation Ranges of Dates

I use this approach:

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
internal sealed class DateRangeAttribute : ValidationAttribute
{
    public DateTime Minimum { get; }
    public DateTime Maximum { get; }

    public DateRangeAttribute(string minimum = null, string maximum = null, string format = null)
    {
        format = format ?? @"yyyy-MM-dd'T'HH:mm:ss.FFFK"; //iso8601

        Minimum = minimum == null ? DateTime.MinValue : DateTime.ParseExact(minimum, new[] { format }, CultureInfo.InvariantCulture, DateTimeStyles.None); //0 invariantculture
        Maximum = maximum == null ? DateTime.MaxValue : DateTime.ParseExact(maximum, new[] { format }, CultureInfo.InvariantCulture, DateTimeStyles.None); //0 invariantculture

        if (Minimum > Maximum)
            throw new InvalidOperationException($"Specified max-date '{maximum}' is less than the specified min-date '{minimum}'");
    }
    //0 the sole reason for employing this custom validator instead of the mere rangevalidator is that we wanted to apply invariantculture to the parsing instead of
    //  using currentculture like the range attribute does    this is immensely important in order for us to be able to dodge nasty hiccups in production environments

    public override bool IsValid(object value)
    {
        if (value == null) //0 null
            return true;

        var s = value as string;
        if (s != null && string.IsNullOrEmpty(s)) //0 null
            return true;

        var min = (IComparable)Minimum;
        var max = (IComparable)Maximum;
        return min.CompareTo(value) <= 0 && max.CompareTo(value) >= 0;
    }
    //0 null values should be handled with the required attribute

    public override string FormatErrorMessage(string name) => string.Format(CultureInfo.CurrentCulture, ErrorMessageString, name, Minimum, Maximum);
}

And use it like so:

[DateRange("2004-12-01", "2004-12-2", "yyyy-M-d")]
ErrorMessage = "Value for {0} must be between {1} and {2}")]

I found issues with the [Range(typeof(DateTime)] annotation and would describe it as "clunky at best" it leaves too much to chance IF it works.

Remote validation seems to be a good way of: avoiding javascript in views and maintaining server side code integrity, personally never like sending code to a client to execute if I can avoid it.

Using @StackThis answer as a base and reference to an article on remote validation in MVC3

Model

public class SomeDateModel
{
    public int MinYears = 18;
    public int MaxYears = 110;

    [Display(Name = "Date of birth", Prompt = "e.g. 01/01/1900")]
    [Remote(action: "ValidateDateBetweenYearsFromNow", controller: "Validation", areaReference: AreaReference.UseRoot, AdditionalFields = "MinYears,MaxYears", HttpMethod = "GET" ,ErrorMessage = "Subject must be over 18")]
    public DateTime? DOB { get; set; }
}

Controller - Deployed at the root directory

namespace Controllers
{
    public class ValidationController : Controller
    {
        [HttpGet]
        [ActionName("ValidateDateBetweenYearsFromNow")]
        public JsonResult ValidateDateBetweenYearsFromNow_Get()
        {
            //This method expects 3 parameters, they're anonymously declared through the Request Querystring,
            //Ensure the order of params is:
            //[0] DateTime
            //[1] Int Minmum Years Ago e.g. for 18 years from today this would be 18
            //[2] int Maximum Years Ago e.g. for 100 years from today this would be 100
            var msg = string.Format("An error occured checking the Date field validity");
            try
            {
                int MinYears = int.Parse(Request.QueryString[1]);
                int MaxYears = int.Parse(Request.QueryString[2]);

                //Use (0 - x) to invert the positive int to a negative.
                var min = DateTime.Now.AddYears((0-MinYears));
                var max = DateTime.Now.AddYears((0-MaxYears));

                //reset the response error msg now all parsing and assignmenst succeeded.
                msg = string.Format("Please enter a value between {0:dd/MM/yyyy} and {1:dd/MM/yyyy}", max, min);
                var date = DateTime.Parse(Request.QueryString[0]);
                if (date > min || date < max)
                    //switch the return value here from "msg" to "false" as a bool to use the MODEL error message
                    return Json(msg, JsonRequestBehavior.AllowGet);
                else
                    return Json(true, JsonRequestBehavior.AllowGet);
            }
            catch (Exception)
            {
                return Json(msg, JsonRequestBehavior.AllowGet);
            }
        }
    }
}

The msg variable is displayed as part of the Html helper ValidationSummary or the Html helper ValidationFor(x=>x.DATETIME)

View

It's important to note that the fields passed as parameter 2 and 3 must exist in the view in order for the remote validation to pass the values to the controller:

    @Html.EditorFor(m => m.DOB)
    @Html.HiddenFor(m => m.MinYears)
    @Html.HiddenFor(m => m.MaxYears)
    @Html.ValidationSummary()

The model and Html helpers will do all the jquery work for you.