public class DateGreaterThanAttribute : ValidationAttribute
{
    private string _startDatePropertyName;

    public DateGreaterThanAttribute(string startDatePropertyName)
    {
        _startDatePropertyName = startDatePropertyName;
    }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        var propertyInfo = validationContext.ObjectType.GetProperty(_startDatePropertyName);
        if (propertyInfo == null)
        {
            return new ValidationResult(string.Format("Unknown property {0}", _startDatePropertyName));
        }
        var propertyValue = propertyInfo.GetValue(validationContext.ObjectInstance, null);
        if ((DateTime)value > (DateTime)propertyValue)
        {
            return ValidationResult.Success;
        }
        else
        {
            var startDateDisplayName = propertyInfo
                .GetCustomAttributes(typeof(DisplayNameAttribute), true)
                .Cast<DisplayNameAttribute>()
                .Single()
                .DisplayName;

            return new ValidationResult(validationContext.DisplayName + " must be later than " + startDateDisplayName + ".");
        }
    }
}

public class AddTranscriptViewModel : IValidatableObject
{
    ...

    [DisplayName("Class Start"), Required]
    [DataType(DataType.Date)]
    [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:MM/dd/yyyy}")]
    [RegularExpression(@"^(1[012]|0?[1-9])[/]([12][0-9]|3[01]|0?[1-9])[/](19|20)dd.*", ErrorMessage = "Date out of range.")]
    public DateTime? ClassStart { get; set; }

    [DisplayName("Class End"), Required]
    [DataType(DataType.Date)]
    [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:MM/dd/yyyy}")]
    [RegularExpression(@"^(1[012]|0?[1-9])[/]([12][0-9]|3[01]|0?[1-9])[/](19|20)dd.*", ErrorMessage = "Date out of range.")]
    [DateGreaterThan("ClassStart")]
    public DateTime? ClassEnd { get; set; }

    ...
}

@using (Html.BeginForm("AddManualTranscript", "StudentManagement", FormMethod.Post, new { id = "studentManagementForm", @class = "container form-horizontal" }))
{
    ...
    <div class="col-md-4" id="divUpdateStudent">@Html.Button("Save Transcript Information", "verify()", false, "button")</div>
    ...
    <div class="col-md-2">
        <div id="divClassStart">
            <div>@Html.LabelFor(d => d.ClassStart, new { @class = "control-label" })</div>
            <div>@Html.EditorFor(d => d.ClassStart, new { @class = "form-control" }) </div>
            <div>@Html.ValidationMessageFor(d => d.ClassStart)</div>
        </div>
    </div>

    <div class="col-md-2">
        <div id="divClassEnd">
            <div>@Html.LabelFor(d => d.ClassEnd, new { @class = "control-label" })</div>
            <div>@Html.EditorFor(d => d.ClassEnd, new { @class = "form-control" }) </div>
            <div>@Html.ValidationMessageFor(d => d.ClassEnd)</div>
        </div>
    </div>
    ...
}

<script type="text/javascript">
    ...
    function verify() {

        if ($("#StudentGrades").data("tGrid").total == 0) {
            alert("Please enter at least one Functional Area for the transcript grades.");
        }
        else {
            $('#studentManagementForm').trigger(jQuery.Event("submit"));
        }
    }
    ...
</script>

DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof(DateGreaterThanAttribute), typeof(DataAnnotationsModelValidator));