27日にじゅうしちにちalso: にじゅうななにちCommon wordMeanings1noun27th day of the monthRefers specifically to the 27th calendar day.会かい議ぎは27日かに行おこなわれます。The meeting will be held on the 27th.2noun27 daysIndicates a duration of 27 days.この薬くすりは27日か分ぶんあります。This medicine is for 27 days.