Fluent Validation custom message for predicate.cs

private bool DateWithinSqlParameters(Event model, DateTime? date, PropertyValidatorContext context)
{
    var maxDate = DateTime.Today.AddYears(30);
    context.Rule.MessageBuilder = c=> $"Invalid date entered for {context.PropertyDescription}. Must be between 1/1/2000 - {maxDate.ToString("M/d/yyyy")}";
    return !date.HasValue || (date.Value >= new DateTime(2000,1,1) && date.Value <= maxDate);
}