Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

FormatDateTime with NULL Date Fields

Posted on 2004-04-10
5
492 Views
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
Comment
Question by:Qosai_DBA
  • 3
  • 2
5 Comments
 
LVL 27

Accepted Solution

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

Featured Post

Free Tool: Site Down Detector

Helpful to verify reports of your own downtime, or to double check a downed website you are trying to access.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
how to center only a line in richedit? 4 61
Delphi XE10 Round Image 2 154
How to load 2 images in same column in Delphi 2 57
RESTRequest Parameter 4 42
Have you ever had your Delphi form/application just hanging while waiting for data to load? This is the article to read if you want to learn some things about adding threads for data loading in the background. First, I'll setup a general applica…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
The Email Laundry PDF encryption service allows companies to send confidential encrypted  emails to anybody. The PDF document can also contain attachments that are embedded in the encrypted PDF. The password is randomly generated by The Email Laundr…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

840 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question