Datetime diference?

I have two datetime strings in 2 edit boxes. How can I find the number of hours between these two values even if it exceeds 24 hrs.

eg: 7/21/2002 1:15:25 AM minus 7/22/2002 2:15:28 PM

thnks
LVL 1
drnadeemAsked:
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CynnaConnect With a Mentor Commented:
Very simple:

function HoursDifference(StartDateTime, EndDateTime: String): Integer;
var d1,d2: TDateTime;
begin
  DateSeparator:='/';  ShortDateFormat:='mm/dd/yyyy';
  TimeSeparator:=':';  LongTimeFormat:='h:m:s';
  d1:=StrToDateTime(StartDateTime);
  d2:=StrToDateTime(EndDateTime);
  Result:=Round((d2-d1)*24);
end;

//DEMO:
//---------

procedure TForm1.Button1Click(Sender: TObject);
begin
  ShowMessage('The difference between '+Edit1.Text+' and '+Edit2.Text+' is '+
              IntToStr(HoursDifference(Edit1.Text, Edit2.Text))+' hours.');
end;
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Lee_NoverCommented:
drdaem if you have Delphi6 then you can use the DateUtils unit and the HoursBetween function
there are also DaysBetween, SecondsBetween, ... check out the DateUtils unit :)
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ChaloCommented:
Try this:
Edit3.Text := DateTimeToStr((StrToDateTime(Edit1.Text) -              StrToDateTime(Edit2.Text))/24);
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CynnaCommented:
Chalo,

Did you tried out your proposed answer?

I see you are new to EE. Proposing an answer is generally not considered a good practice here. But if you propose it anyway, you should be sure it works, and it's a different one than other poster suggested. In this case, neither is true.
In the future, please consider posting a comment and let the asker choose the right answer for himself.
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kretzschmarCommented:
only a b-grade for a perfect work ?

:-(
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CynnaCommented:
:-) ...

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