| Overload | Description | 
|---|---|
| Subtraction(TdPeriodDate,TdIntervalDayToSecond) | Subtracts the specified TdIntervalDayToSecond from a TdPeriodDate. | 
| Subtraction(TdPeriodDate,TdIntervalYearToMonth) | Subtracts the specified TdIntervalYearToMonth from a TdPeriodDate. | 
| Subtraction(TdPeriodDate,TimeSpan) | Subtracts the specified TimeSpan from a TdPeriodDate. |