gistfile1.cs

public bool IsDate(String date)
{
  bool result = true;
  String datePattern = @"^(19[0-9]{2}|2[0-9]{3})-(0[1-9]|1[012])-([123]0|[012][1-9]|31)$";
  
  if(Regex.IsMatch(date, datePattern) == false)
  {
    result = false;
  }
  return result;
}

public bool IsTime(String time)
{
  bool result = true;
  String timePattern = @"^([0-9]{2}):([0-9]{2}):([0-9]{2})$";
  
  if(Regex.IsMatch(time, timePattern) == false)
  {
    result = false;
  }
  return result;
}