I was reminded by Mondays while looking in the Transparent.com French Word of the Day archives. “Lundi” is their word for January 18. And they write:
Il semble que quelqu’un a la morosité du lundi!
Looks like someone has a case of the Mondays!
There’s another great, similar but better in some respects, service for Spanish: a Spanish Word of the Day from Dictionary.com
To read more about this and other tips on learning conversational Spanish fast, see my article about it on Wizzley.