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function IncYear(const AValue: TDateTime;
  const ANumberOfYears: Integer = 1): TDateTime;
// function IncMonth is in SysUtils
function 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;
  const ANumberOfMinutes: Int64 = 1): TDateTime;
function IncSecond(const AValue: TDateTime;
  const ANumberOfSeconds: Int64 = 1): TDateTime;
function IncMilliSecond(const AValue: TDateTime;
  const ANumberOfMilliSeconds: Int64 = 1): TDateTime;
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