Delphi中获取指定年月的周、日数

Delphi中获取指定年月的周、日数2012-02-02 博客园万一WeeksInAYear、WeeksInYear、DaysInAYear、DaysInAMonth、DaysInYear、DaysInMonth - 获取指定年月的周、日数

DateUtils.DaysInYear（）;
DateUtils.DaysInMonth（）;
DateUtils.DaysInAYear（）;
DateUtils.DaysInAMonth（）;
DateUtils.WeeksInYear（）;
DateUtils.WeeksInAYear（）;

unit Unit1;

interface

uses
 Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
 Dialogs, StdCtrls;

type
 TForm1 = class（TForm）
  procedure FormCreate（Sender: TObject）;
 end;

var
 Form1: TForm1;

implementation

{$R *.dfm}

uses DateUtils;

procedure TForm1.FormCreate（Sender: TObject）;
var
 dt: TDateTime;
 w: Word;
begin
 dt := StrToDateTime（"2009-5-20 11:22:33"）;

 {指定日期所在年的总天数}
 w := DaysInYear（dt）;    //365

 {指定日期所在月的总天数}
 w := DaysInMonth（dt）;    //31

 {指定年的总天数}
 w := DaysInAYear（2009）;   //365

 {指定年、指定月的总天数}
 w := DaysInAMonth（2009, 5）; //31

 {指定日期所在年的总周数}
 w := WeeksInYear（dt）;    //53

 {指定年的总周数}
 w := WeeksInAYear（2009）;  //53
end;

end.