On Wed, 30 Nov 2005, Joost van der Sluis wrote:
> > I am developing my first app using Lazarus and now I have found a serious
> > problem with date with Lazarus. This show me a date 1/10/1899. I have been
> > in zeos forum and they say that problem is for FPC not zeos. Somebody says
> > that the problem is with the structure that use Lazarus to see the date,
> > before like delphi 2,3,4 , but now it uses the nwe form Tdatetime and the
> > problems it is. Really this problem is from compiler.
Not the compiler, the RTL or FCL.
> > So0mebody here has a cluee how can we resolve this problem??
> > I am using Lazarus so heavy and I dont wanna go to anyplace!!
> > Really , Lazarus is a good job!!!
>
> First we need to know which versions of fpc and lazarus you're using.
>
> The latest versions of fpc uses the same system for date fields as
> Delphi 6 and higher. If ZEOS doesn't support this system, and still
> relies on the Delph-2 system, it's a problem of ZEOS, I would say.
No, it's a FPC problem.
Delphi actually does a dirty trick with the 'NativeFormat' parameter of
GetFieldData. If NativeFormat is false, it does a recursive call of
itself with a temporary buffer, and then converts the data with
an auxiliary method.
This method takes care of the conversion TTimeStamp -> TDateTime
because TDateTimeField sets calls GetFieldData with NativeFormat
set to False.
So we had to fix this in TDataset.
I've done it, it's committed, if someone could please give it a test,
I would be grateful.
This means that a TDataset Descendent always should use the OLD method,
or must override the DataConvert method so it does NOT do the conversion
again in the case of datetime fields.
Michael.
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