inline Standard_Real  Quantity_Period::MillisecondPeriod(){
 return (1E+3);
}

inline Standard_Real  Quantity_Period::SecondPeriod(){
 return (1E+6);
}


inline Standard_Real  Quantity_Period::MinutePeriod(){
 return (60.0E+6);
}

inline Standard_Real  Quantity_Period::HourPeriod(){
 return (3600.0E+6);
}

inline Standard_Real  Quantity_Period::DayPeriod(){
 return (86400.0E+6);
}