On Tue, 18 Nov 2014, Philippe wrote:
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;
const FormatSettings: TFormatSettings
):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 ...
It should be, I will check.
Anyway, as Graeme hinted: ShortDateFormat contains a format string, and / is a placeholder for the date
separator character on the computer on which the program is running.
If you want to force a character, you can enclose it in quotes:
ShortDateFormat:='dd"/"mm"/"yyyy'
will always use / as the date separator, no matter what the internatonalization
settings on the PC.
But it is bad practice to do so.
Secondly, it is a common mistake to think that StrToDate will always correctly
perform the opposite of DateToStr.
It does not, but this is documented.
Michael.
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