e. To say "Monday" one will have to resort to {se detri be li jydy pa}, not a very short _expression_, same for months. So to imitate major languages the 7+12 extra words (pavdei, pavmasti etc. or equivalents) might still be needed.
Yeah I can see that. {ca de'i li jydy xo} is still probably the best way to ask "What day of the week is it" though; I mean, {lo cabdei cu mo} is rather ambiguous :p