[AttributeUsage(AttributeTargets.Property)]
    public class DateLimitValidationAttribute : RequiredAttribute
    {
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            base.IsValid(value, validationContext);
            if (value == null) return ValidationResult.Success;

            var date = Convert.ToDateTime(value);

            var ageOfDateInDays = DateTime.Today.Subtract(date).Days;

            if (ageOfDateInDays > 90)
            {
                return new ValidationResult("Select Date can not be older than 90 days, or 3 months.");
            }
            else
            {
                return ValidationResult.Success;
            }
        }
    }