Avoid temporary Date and normalization

Rather than possibly calculating Date=((Date=(Date+int))+int) with a
normalization involved for each operator+() force Date=(Date+(int+int))

Change-Id: I6c4b30749d138c0b041ffc9e37796b6f64b6d461
diff --git a/sc/source/core/data/conditio.cxx b/sc/source/core/data/conditio.cxx
index 9cdb73ea..3f83ea2 100644
--- a/sc/source/core/data/conditio.cxx
+++ b/sc/source/core/data/conditio.cxx
@@ -1649,8 +1649,8 @@ bool ScCondDateFormatEntry::IsValid( const ScAddress& rPos ) const
                const DayOfWeek eDay = rActDate.GetDayOfWeek();
                if( eDay != SUNDAY )
                {
                    Date aBegin(rActDate - 8 - static_cast<sal_Int32>(eDay));
                    Date aEnd(rActDate - 2 - static_cast<sal_Int32>(eDay));
                    Date aBegin(rActDate - (8 + static_cast<sal_Int32>(eDay)));
                    Date aEnd(rActDate - (2 + static_cast<sal_Int32>(eDay)));
                    return aCellDate.IsBetween( aBegin, aEnd );
                }
                else
@@ -1666,8 +1666,8 @@ bool ScCondDateFormatEntry::IsValid( const ScAddress& rPos ) const
                const DayOfWeek eDay = rActDate.GetDayOfWeek();
                if( eDay != SUNDAY )
                {
                    Date aBegin(rActDate - 1 - static_cast<sal_Int32>(eDay));
                    Date aEnd(rActDate + 5 - static_cast<sal_Int32>(eDay));
                    Date aBegin(rActDate - (1 + static_cast<sal_Int32>(eDay)));
                    Date aEnd(rActDate + (5 + static_cast<sal_Int32>(eDay)));
                    return aCellDate.IsBetween( aBegin, aEnd );
                }
                else
@@ -1682,8 +1682,8 @@ bool ScCondDateFormatEntry::IsValid( const ScAddress& rPos ) const
                const DayOfWeek eDay = rActDate.GetDayOfWeek();
                if( eDay != SUNDAY )
                {
                    return aCellDate.IsBetween( rActDate + 6 - static_cast<sal_Int32>(eDay),
                            rActDate + 12 - static_cast<sal_Int32>(eDay) );
                    return aCellDate.IsBetween( rActDate + (6 - static_cast<sal_Int32>(eDay)),
                            rActDate + (12 - static_cast<sal_Int32>(eDay)) );
                }
                else
                {