"when is my birthday" translates to "cuando es mi cumpleaños" in Spanish.
"Mi cumpleaños". That is how you say "my birthday".
cumpleanos
cumpleanos
Mi cumpleaños es (your birthday)
Cuando(when) es(its) tu(your) cumpleaños(birthday).
it's his birthday - "es su cumpleanos"
regalos
feliz cumpleaños
You can say "birthday party" by using the word "fiesta de cumpleaños" in Spanish.
felis cupliano's is happy birthday
You can say "Feliz cumpleaños, Papá".
Well in Spanish they say Felix complianos