생일이에요

it's someone's birthday

→ 생일
phrase Rare #18,182
it's someone's birthday A polite way to say that it is someone’s birthday; whose birthday it is is usually clear from context.
KO: 오늘은 제 생일이에요.
EN: Today is my birthday.

필립 생일 이에요

It's Philip's birthday.

— 언터처블: 1%의 우정 (2011)

누구 생일 이에요?

Whose birthday is it?

— Ballerina (2023)

근데 오늘은 제 생일 이에요

But today is my birthday.

— 인터스텔라 (2014)

오늘이 제 생일 이에요

Today is my birthday.

— 마농의 샘 2부 (1986)