一月四日（Jan.4th），简单为1月，指一月的第一天；若同时使用“January first”等表述则表示具体日期。
January fourth or Jan 4th. It is a simple and straightforward translation, where "fourth" stands for the ordinal number of days in January (1st). The first occurrence refers to January's beginning day; others use expressions like “January the first” when referring specifically to January’s day. For instance: “January fourth.”
