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How to calculate the elapsed time between 2 DateTime fields 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 5.x
Views
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Tomas Rutkauskas

Using Delphi 5, I need to calculate the elapsed time between 2 DateTime fields with 
the result returned in Days, Hours and Minutes format.

Answer:

Subtract the values AsDateTime and then use DecodeDate and DecodeTime on the result:


1   procedure TMyForm.Button1Click(Sender: TObject);
2   var
3     StartT, EndT, DeltaT: TDateTime;
4     Days, Hour, Min, Sec, MSec: Word;
5   begin
6     StartT := StrToDateTime('27.02.2000 13:45');
7     EndT := StrToDateTime('02.03.2000 17:30');
8     DeltaT := EndT - StartT;
9     Days := trunc(DeltaT);
10    DecodeTime(DeltaT, Hour, Min, Sec, MSec);
11    ShowMessage(' Time elapsed: ' + IntToStr(Days) + ' days, ' + IntToStr(Hour) +
12      ' hours, ' + IntToStr(Min) + ' minutes ');
13  end;



When trying to actually run the above sample, you have to change the string constants used to initialize the datetime vars according to your settings in ShortDateFormat and LongTimeFormat.

			
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