Is this for real? Like TGIF (Thank God It's Friday) - or is Duo just making something up for practice purposes?
i think it's a real thing. saw a hashtag trending on twitter that was like "feliz dayoftheweek". guess it's something spanish speakers do.
I say "¡Feliz día!" and "¡Feliz noche!" all the time at work. It's a valid expression, used somewhat more often for partings than for greetings.
Actually, "happy Friday" is common to say (or any day of the week). Or happy Fri-yay....because you're excited the weekend is here! It's just like wishing someone a great (or happy) day. :-) Google Friyay or instagram search #friyay or #HappyFriday and lots will come up.
It is real thing. I am a member of facebook group of Valencian people and they post all the time memes like Feliz Sabado! or Feliz Viernes! Feliz Martes!