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month and day (of the year); (the) date
「月日」 has another reading with different meanings.
長い月日を経てようやく夢を実現できた。
I was able to realize my dream after many years.
月日とともに悲しみは薄れていった。
The sadness faded with time.
彼との月日を振り返ると懐かしい。
Looking back on my time with him makes me nostalgic.