function CompareDateTime(const A, B: TDateTime): TValueRelationship; function SameDateTime(const A, B: TDateTime): Boolean; function CompareDate(const A, B: TDateTime): TValueRelationship; function SameDate(const A, B: TDateTime): Boolean; function CompareTime(const A, B: TDateTime): TValueRelationship; function SameTime(const A, B: TDateTime): Boolean;
function SameDateTime(const A, B: TDateTime): Boolean;
function CompareDate(const A, B: TDateTime): TValueRelationship;
function SameDate(const A, B: TDateTime): Boolean;
function CompareTime(const A, B: TDateTime): TValueRelationship;
function SameTime(const A, B: TDateTime): Boolean;
所以两个日期直接相减即可判断大小.