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FormatDateTime with NULL Date Fields

Posted on 2004-04-10
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Last Modified: 2010-04-05
Hi all,
  When using FormatDateTime routine with a NULL Date fields, this function return 30/12/1899.
  So, How to avoid this undesirable value.

Thanks,
Khalid.
0
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Question by:Qosai_DBA
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5 Comments
 
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by:
kretzschmar earned 30 total points
ID: 10795976
if dataset.fieldbyname('DateFieldName').isNull then
  result := ''
else
  result := formatDateTime(...);

meikl ;-)
0
 
LVL 1

Author Comment

by:Qosai_DBA
ID: 10796505
Hi kretzschmar,
  Your example is correct when use FormatDateTime with Database Fields, but what can I do when using variables of TDateTime as a datatype with no value?

Thanks,
khalid.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 10796518
if datevalue = 0 then
  result := ''
else
  result := formatDateTime(...);

meikl ;-)
0
 
LVL 1

Author Comment

by:Qosai_DBA
ID: 10800020
Hi again,
I'm sorry kretzschmar, maybe I'm facing some problem.
this's my code

procedure TForm1.Button1Click(Sender: TObject);
var v_Date: TDatetime;
begin
  if(v_Date = 0)then
    Form1.Label1.Caption:= ''  // Return 30/12/1899
  else
    Form1.Label1.Caption:= FormatDateTime('dd/mm/yyyy', v_Date);
end;

Thanks,
Khalid.
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 10800126
well khalid,

which value should v_date have?
(currently it may random, because of a local uninitilaized var)

meikl ;-)
0

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