D0 - SUN
D1/DI - MON
D2 - TUE
D3 - WED
D4 - THURS
D5 - FRI
D6 - SAT

FIRST1 - On (DAY)
FIRST2 - DEPENDS ON DAY

D0 - As Next Week Begins
D1 - As the Week Begins
D2-D4 - During the Week
D5 - Heading into the Weekend
D6 - During the Weekend