For the sake of convenience, some programs record all dates as simple numbers. The number 8796, for example, might refer in some systems to the 8796th day of the 20th century. In other programs, a number might represent the nth day of the current year.
有些程式為了運算方便，將日期以數字形式代表，譬如 8796 代表本世紀（一九○○年元旦）以後的第 8796 天；還有些數字代表從今年初開始推算的第幾天。