if( not ( $day == 0 or $day == 6 ) ) { ...
if( $day and $day != 6 ) { ...
unless( $day == 0 or $day == 6 ) { ...
Examine what is said, not who speaks.
"Efficiency is intelligent laziness." -David Dunham
"Think for yourself!" - Abigail
"Memory, processor, disk in that order on the hardware side. Algorithm, algorithm, algorithm on the code side." - tachyon