delphi xe10.2 统计（计算）日期

unit Unit1; interface uses    System.SysUtils,     Vcl.Forms,  Vcl.StdCtrls, Vcl.ComCtrls,  Vcl.Controls, System.Classes; type   TForm1 = class(TForm)     Button1: TButton;     DateTimePicker1: TDateT

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