Vladimir S

<input class="datepicker" data-date-format="mm/yyyy">

$('.datepicker').datepicker({
    format: 'mm/yyyy'
});

public static bool TryValidateObject(object instance, ValidationContext validationContext, ICollection<ValidationResult> validationResults, bool validateAllProperties) {
            if (instance == null) {
                throw new ArgumentNullException("instance");
            }
 
            if (validationContext != null && instance != validationContext.ObjectInstance) {
                throw new ArgumentException(Resources.DataAnnotationsResources.Validator_InstanceMustMatchValidationContextInstance, "instance");
            }
 
            bool result = true;
            bool breakOnFirstError = (validationResults == null);
 
            foreach (ValidationError err in GetObjectValidationErrors(instance, validationContext, validateAllProperties, breakOnFirstError)) {
                result = false;
 
                if (validationResults != null) {
                    validationResults.Add(err.ValidationResult);
                }
            }
 
            return result;
        }