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How to calculate the week from a given date Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
30-Aug-02
Category
Algorithm
Language
Delphi All Versions
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Tomas Rutkauskas

How to calculate the week from a given date

Answer:

The code below tells you which week the specified date is in, and also the 
corresponding day of the week. The date format it handles is "06/25/1996". You have 
to create a form named "Forma" with a TEdit named "Edit1", four labels and a button 
named "GetWeekBtn".


1   unit Forma;
2   
3   interface
4   
5   uses
6     SysUtils, WinTypes, WinProcs, Messages, Classes, Graphics, Controls,
7     Forms, Dialogs, StdCtrls;
8   
9   type
10    TForma1 = class(TForm)
11      Edit1: TEdit;
12      Label1: TLabel;
13      Label2: TLabel;
14      Label3: TLabel;
15      GetWeekBtn: TButton;
16      Label4: TLabel;
17      procedure GetWeekBtnClick(Sender: TObject);
18      procedure FormCreate(Sender: TObject);
19    private
20      { Private declarations }
21      function HowManyDays(pYear, pMonth, pDay: word): Integer;
22    public
23      { Public declarations }
24    end;
25  
26  var
27    Forma1: TForma1;
28  
29  implementation
30  
31  {$R *.DFM}
32  
33  uses
34    Inifiles;
35  
36  procedure TForma1.FormCreate(Sender: TObject);
37  var
38    WinIni: TInifile;
39  begin
40    WinIni := TIniFile.Create('WIN.INI');
41    WinIni.WriteString('intl', 'sShortDate', 'MM/dd/yyyy');
42    WinIni.Free;
43  end;
44  
45  function TForma1.HowManyDays(pYear, pMonth, pDay: Word): Integer;
46  var
47    Sum: Integer;
48    pYearAux: Word;
49  begin
50    Sum := 0;
51    if pMonth > 1 then
52      Sum := Sum + 31;
53    if pMonth > 2 then
54      Sum := Sum + 28;
55    if pMonth > 3 then
56      Sum := Sum + 31;
57    if pMonth > 4 then
58      Sum := Sum + 30;
59    if pMonth > 5 then
60      Sum := Sum + 31;
61    if pMonth > 6 then
62      Sum := Sum + 30;
63    if pMonth > 7 then
64      Sum := Sum + 31;
65    if pMonth > 8 then
66      Sum := Sum + 31;
67    if pMonth > 9 then
68      Sum := Sum + 30;
69    if pMonth > 10 then
70      Sum := Sum + 31;
71    if pMonth > 11 then
72      Sum := Sum + 30;
73    Sum := Sum + pDay;
74    if ((pYear - (pYear div 4) * 4) = 30) and (pMonth > 2) then
75      inc(Sum);
76    HowManyDays := Sum;
77  end;
78  
79  procedure TForma1.GetWeekBtnClick(Sender: TObject);
80  var
81    ADate: TDateTime;
82    EditAux: string;
83    Week, year, month, day: Word;
84  begin
85    EditAux := Edit1.Text;
86    ADate := StrToDate(EditAux);
87    Label1.Caption := DateToStr(ADate);
88    DecodeDate(Adate, Year, Month, Day);
89    case DayOfWeek(ADate) of
90      1: Label4.Caption := 'Sunday';
91      2: Label4.Caption := 'Monday';
92      3: Label4.Caption := 'Tuesday';
93      4: Label4.Caption := 'Wednesday';
94      5: Label4.Caption := 'Thursday';
95      6: Label4.Caption := 'Friday';
96      7: Label4.Caption := 'Saturday';
97    end;
98    Week := (HowManyDays(year, month, day) div 7) + 1;
99    Label3.Caption := 'Week No. ' + IntToStr(Week);
100 end;
101 
102 end.


			
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