glücklich buckeltag is the translation in German. It is translated from English to German. German is mostly spoken in the European countries.
Assuming you mean "how" to say happy in German, there are a couple of different ways: Froh and gluecklich.
Faschingsdienstag is the translation in German. It is translated from English to German. German is mostly spoken in the European countries.
Happy Friday in German is glücklicher Freitag
Tuesday is the worst day = Dienstag ist der schlimmster Tag
Bon anniversaire a mardi!
happy - glücklich Also fröhlich, froh
In Pennsylvania German, you can say "Ei glickliche Geburdsdaag!" to wish someone a happy birthday.
I am not a happy puppy is an English idiom and cannot be translated into German in a way that conveys it's meaning.
happy married life = glückliches Eheleben
Frohes Neues Jahr.
Die glücklichen Kinder.
"Happy Saint Patrick´s Day" in German is: Fröhlichen St. Patricks Tag