struct Time : Date, RelOps< Time, Moveable<Time> > {
....
	void   Set(int64 scalar);
	int64  Get();
};

Time   operator+(Time a, int64 seconds);
Time   operator+(int64 seconds, Time a);
Time   operator-(Time a, int64 secs);
Time&  operator+=(Time& a, int64 secs);
Time&  operator-=(Time& a, int64 secs);