Delphi日期函数、日期加减Delphi里有现成的函数可以实现日期加减，是在DateUtils单元里的。function IncYear(const AValue: TDateTime;const ANumberOfYears: Integer = 1): TDateTime;/ function IncMonth is in SysUtilsfunction IncWeek(const AValue: TDateTime;const ANumberOfWeeks: Integer = 1): TDateTime;function IncDay(const AValue: TDateTime;const ANumberOfDays: Integer = 1): TDateTime;function IncHour(const AValue: TDateTime;const ANumberOfHours: Int64 = 1): TDateTime;function IncMinute(const AValue: TDateTime;c
