//This is a full Value object now
public static Money Create(string currency, decimal amount, DateTime?time)
{
DateTime t = time != null ? time.Value : DateTimeRangeExtensions.GetDate();
return(new Money(currency, amount, t));
}
public static Money GetDifference(this Money money, Money _money)
{
if (money.Currency != _money.Currency)
{
throw new Exception("Different currencies");
}
return(Money.Create(money.Currency, Math.Abs(money.Amount - _money.Amount), DateTimeRangeExtensions.GetDate()));
}