YOU SAID:
yesterday was new years eve
INTO JAPANESE
昨日は大years日でした
BACK INTO ENGLISH
Yesterday was a big years day
INTO JAPANESE
昨日は大きな年でした
BACK INTO ENGLISH
Yesterday was a big year
INTO JAPANESE
昨日は大きな年でした
BACK INTO ENGLISH
Yesterday was a big year
That didn't even make that much sense in English.