Excellente, que vous aviez une bonne journee. (But this is very formal, just like the English. If you want to say "Have a nice day" people typically just say "Bonne journee")
'Have a great day' is 'Avior un grand jour' in French.
un service excellent
grand jour be pas
"Excellent work" would be Excellent travail
c'est un excellent film.
To say "Have a great Valentine's Day" in French, you would say "Bonne fête de la Saint-Valentin !" This phrase conveys warm wishes for the occasion. You can also simply say "Bonne Saint-Valentin !" for a more casual expression.
in french to say great selling its vente de grands
vous etes un bon professeur (you are a good teacher) or vous etes un professeur fantastique (you are a fantastic teacher)
tres bien mon ami
Great grandmother is 'arrière-grand-mère' in French.
'on this day' in french is 'ce jour-là'
comment allez vous ? Votre journee a t elle ete bonne ?