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`happy birthday`: English to Spanish.

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happy birthday

A standard expression used to convey good wishes to someone on the anniversary of their birth. (formal/informal, common)

Translations: feliz cumpleaños;
Happy birthday! I hope you have a wonderful day. — ¡Feliz cumpleaños! Espero que tengas un día maravilloso.

happy birthday

An idiomatic or affectionate way to celebrate someone’s birthday, sometimes used in songs or informal greetings. (informal, common)

Translations: feliz cumpleaños; que cumplas muchos más;
We sang happy birthday as she blew out the candles. — Cantamos feliz cumpleaños mientras ella soplaba las velas.

happy birthday

Used sarcastically to comment on an unfortunate event that coincides with one’s birthday or to mock a situation. (informal, sarcastic/ironic)

Translations: feliz cumpleaños (con sarcasmo); feliz cumpleaños (irónico);
My car broke down on the way to my party. Happy birthday to me! — Mi coche se averió camino a mi fiesta. ¡Feliz cumpleaños para mí!