Note that the days of the week are not capitalized in French. Also, all days are masculine (le, un). Sometimes expressions involving the days are translated similarly as in English.
Expressions Involving the Days of the Week (Like English)
French
English
tout la journée mardi
all day Tuesday
tous les dimanche
all Sunday / every Sunday
However, some are not as easily translated.
Expressions Involving the Days of the Week (Unlike English)
French
English
lundi passé
last Monday
mardi en huit
next Tuesday
vendredi en quinze
two weeks from Friday
De bonne heure samedi matin
early Saturday morning
When saying an event occurs or has occurred on a certain, be sure to put le in front of it.