Re: CTime getting skewed due to regional settings

From:
=?Utf-8?B?UFJNQVJKT1JBTQ==?= <PRMARJORAM@discussions.microsoft.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Mon, 14 Jul 2008 05:01:00 -0700
Message-ID:
<EB8890C7-EB85-4B0A-8898-C86899935BB2@microsoft.com>
I am writing to a DateTime field but via a dynamically constructed SQL
statement:

String sql("INSERT INTO WorkflowAction (ID, WorkflowID, FilterID, SeqNo,
ReceiveByDate, Path ) VALUES(");

sql.append(ToString<KeyId>(req->GetKey()));
sql.append(1,',');
sql.append(ToString<KeyId>(workflow->GetKey()));
sql.append(1,',');
sql.append(ToString<ActionID>(eRequest));
sql.append(",1,",3); // seq # - request always first
sql.append(1,'\'');
sql.append( req->GetReceiveByDate().ToDBString());
sql.append(1,'\'');
sql.append(1,',');
sql.append(1,'\'');
sql.append( req->GetDocument()->GetPath().c_str());
sql.append(1,'\'');
sql.append(")");

conn->ExecuteSQL(sql.c_str());

But what has changed now is I call ToDBString, which uses the following

String DateTime::ToDBString()const
{
    struct tm timeinfo;
    char timebuf[26];

    memset(timebuf,0,26);

    errno_t errNo = localtime_s(&timeinfo, &mRawTime);
    assert(errNo == 0 );

    strftime(timebuf,26,"%Y-%m-%d ",&timeinfo);
    return timebuf;

}

as opposed to previously using the ToString function which used the following

    strftime(timebuf,26,"%x",&timeinfo);

The ToString is still used within the presentation layer and dates are
correctly diplayed in host locale, but now when i write the dates they are
locale neutral, this allows them to then be interpreted correctly relative to
the locale when read back in.

Hope this makes sense?

"Giovanni Dicanio" wrote:

"PRMARJORAM" <PRMARJORAM@discussions.microsoft.com> ha scritto nel messaggio
news:1B6D7EDA-0C73-4140-B857-1D06D6A03332@microsoft.com...

It seems i may have solved this problem with a little help from various
articles and forums on the iternet.

Would seem you need to write the date in a common format such as
YYYY-MM-DD,
rather than in your host locale. On reading it back in, it is adjusted
accordingly to the hosts locale.

I just hope the above format works on ORACLE too?


I thought you had a need to write dates using an /ad hoc/ type, as SQL
Server DATETIME (which I think is stored in a binary format, maybe
BINARY(8)).

Of course, writing the date as a pure string, with a predefined fixed
format, will work, because I think every database can store strings :)

Giovanni

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