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날이에요

it's a day

→ 날
phrase Uncommon #9,348
it's a day A polite form meaning “it is a day” or “it’s the day for...” depending on the noun or description before it. 날 means “day,” and 이에요 is the polite form of “to be” after a consonant-ending noun.
KO: 오늘은 특별한 날이에요.
EN: Today is a special day.

오늘은 장 보는 날 이에요.

Today is shopping day.

끔찍한 날 이에요

It's a terrible day.

— 어바웃 타임 (2013)

오늘은 선생님의 학교 첫 날 이에요

Today is the teacher’s first day at school.

— 블랙 (2005)

아름다운 날 이에요

It's a beautiful day.

— 양철북 (1979)

마지막 날 이에요

It's the last day.

— 더 플랫폼 (2019)