const CTimeSpan& operator +=( CTimeSpan timeSpan );
const CTimeSpan& operator -=( CTimeSpan timeSpan );
Remarks
These operators allow you to add and subtract a CTimeSpan object to and from this CTimeSpan.
Example
// example for CTimeSpan::operator +=, -=
CTimeSpan ts1( 10 ); // 10 seconds
CTimeSpan ts2( 100 ); // 100 seconds
ts2 -= ts1;
ASSERT( ts2.GetTotalSeconds() == 90 );