public StandardInstrument(string name, string date)
{
_name = name;
_dateTime = DateTime.ParseExact(date, "yyyy-MM-dd", provider);
if (_dateTime.CompareTo(TwoWeeksLater) > 0)
{
_valid = ValidState.OK;
}
else if (_dateTime.CompareTo(Today) > 0)
{
_valid = ValidState.WillExpireSoon;
}
else
{
_valid = ValidState.Expired;
}
}