在月底的英文是：by the end of the month;
雙語例句：
妳的費用壹定要在月底以前辦理報銷。
Make?sure?your?claims?for?expenses?are?submitted?by?the?end?of?the?month.?
歐洲各銀行競相在月底之前修改高管薪酬協議，此舉旨在遵守歐盟（EU）新的獎金規則，並在即將召開的股東年會上獲得股東批準。
Banks?across?Europe?are?racing?to?amend?executive?pay?deals?by?the?end?of?the?month?in?an?attempt?to?adhere?to?new?EU?bonus?rules?and?secure?shareholder?approval?at?upcoming?annual?meetings.?
按照合同規定，妳必須在月底前付款。
You?are?bound?by?the?contract?to?pay?before?the?end?of?the?month.?
政府希望法庭能在月底前宣布其判決結果。
The?government?hopes?the?court?will?announce?its?findings?before?the?end?of?the?month.?
他將在月底前回來。
He?will?be?back?before?the?month?is?out.?