[fpc-pascal] date formating dificulty

[Philippe]

Em 18.11.2014 09:49, Philippe escreveu: 

> I wrote a program: 
> 
>
- windows 8 32 bits 
> 
> - lazarus 1.2.4 ... fpc 2.6.4 
> 
> then I
copied it to another computer 
> 
> - windows 7 64 bits 
> 
> - lazarus
1.0.14 .... fpc 2.6.2 
> 
> and got into trouble with dates format!
programs behave diferent way, and what was working on the fisrt computer
does not work properly in the second! 
> 
> I guess I need some tutorial
(I looked for but did not find anything :( !) 
> 
> why formatDateTime(
'DD/MM/YYYY', now) returns 18-11-2014 and not 18/11/2014 ? 
> 
>
strtodate( formatDateTime( 'DD/MM/YYYY', now)) works ok on the w 8 32
bits, but arise an exception on the w 7 64 bits. 
> 
> I am confused
with the following syntax 
> 
> function FormatDateTime( 
> 
> const
FormatStr: string; 
> 
> DateTime: TDateTime [2]; 
> 
> const
FormatSettings: TFormatSettings [3] 
> 
> ):string; 
> 
> how does it
work between two format especifications: FormatStr and FormatSettings ?

> 
> appreciate any example of good programming pratise of data
formating to avoid bad surprise moving program from an OS to another !

> 
> Philippe 
> 
> on
http://www.freepascal.org/docs-html/rtl/sysutils/strtodate.html 
> 
> I
found 
> 
> Program Example19;
> 
> { This program demonstrates the
StrToDate function }
> 
> Uses sysutils;
> 
> Procedure TestStr (S :
String);
> 
> begin
> Writeln (S,' : ',DateToStr(StrToDate(S)));
>
end;
> 
> Begin
> 
> Writeln ('ShortDateFormat ',ShortDateFormat);
>
TestStr(DateTimeToStr(Date));
>
TestStr('05'+DateSeparator+'05'+DateSeparator+'1999');
>
TestStr('5'+DateSeparator+'5');
> TestStr('5');
> End.
> 
> the compiler
warns that ShortDateFormat is deprecated ... which is not informed in
the doc ... 
> 
> _______________________________________________
>
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>
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Links:
------
[1]
http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
[2]
http://www.freepascal.org/docs-html/rtl/system/tdatetime.html
[3]
http://www.freepascal.org/docs-html/rtl/sysutils/tformatsettings.html
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