- wxDate &operator+=(long i) { m_date += wxTimeSpan::Days(i); return *this; }
- wxDate &operator-=(long i) { m_date -= wxTimeSpan::Days(i); return *this; }
+ wxDate &operator+=(long i) { m_date += wxTimeSpan::Days((int)i); return *this; }
+ wxDate &operator-=(long i) { m_date -= wxTimeSpan::Days((int)i); return *this; }