Date in File Name: Difference between revisions

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'''English''' | [[Date-in-File-Name-Russian|Русский]]
{{LangSwitch}}
[[Category:HowTo]]
[[Category:snippets]]
In the case you have to build a file name after the current date, so that it will look like ''data_mm_dd_yyyy.txt'' you can use the following simple function to get the string name of the file.


=Date in File Name=
<code>
QString FileNameHandler::todayFileName() {
    QDate today = QDate::currentDate();
    QString relativeFileName( "data_" );
    relativeFileName.append( QString::number( today.month() ) );
    relativeFileName.append( "''" );
    relativeFileName.append( QString::number( today.day() ) );
    relativeFileName.append( "''" );
    relativeFileName.append( QString::number( today.year() ) );
    relativeFileName.append( ".txt" );
    return relativeFileName;
}
</code>
 
Or its shorter version that uses the overloading of the + operator for QString:


In the case you have to build a file name after the current date, so that it will look like ''data_mm_dd_yyyy.txt'' you can use the following simple function to get the string name of the file.
<code>
QString FileNameHandler::todayFileName() {
    QDate today = QDate::currentDate();
    QString relativeFileName( "data_" );
    relativeFileName + QString::number( today.month()
        + "''" + QString::number( today.day() )
        + "''" + QString::number( today.year() )
        + ".txt";
    return relativeFileName;
}
</code>


Or its shorter version that uses the overloading of the + operator for QString:
The fastest - and clearest - version, without calling a custom function, is


The fastest – and clearest – version, without calling a custom function, is
<code>
QString filename = QDate::currentDate().toString("'data_'MM_dd_yyyy'.txt'");
</code>


and when the files should get ordered chronological, then use
and when the files should get ordered chronological, then use


===Categories:===
<code>
 
QString filename = QDate::currentDate().toString("'data_'yyyy_MM_dd'.txt'");
* [[:Category:HowTo|HowTo]]
</code>
* [[:Category:snippets|snippets]]

Latest revision as of 13:39, 28 June 2015

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In the case you have to build a file name after the current date, so that it will look like data_mm_dd_yyyy.txt you can use the following simple function to get the string name of the file.

QString FileNameHandler::todayFileName() {
    QDate today = QDate::currentDate();
    QString relativeFileName( "data_" );
    relativeFileName.append( QString::number( today.month() ) );
    relativeFileName.append( "''" );
    relativeFileName.append( QString::number( today.day() ) );
    relativeFileName.append( "''" );
    relativeFileName.append( QString::number( today.year() ) );
    relativeFileName.append( ".txt" );
    return relativeFileName;
}

Or its shorter version that uses the overloading of the + operator for QString:

QString FileNameHandler::todayFileName() {
    QDate today = QDate::currentDate();
    QString relativeFileName( "data_" );
    relativeFileName + QString::number( today.month()
        + "''" + QString::number( today.day() )
        + "''" + QString::number( today.year() )
        + ".txt";
    return relativeFileName;
}

The fastest - and clearest - version, without calling a custom function, is

QString filename = QDate::currentDate().toString("'data_'MM_dd_yyyy'.txt'");

and when the files should get ordered chronological, then use

QString filename = QDate::currentDate().toString("'data_'yyyy_MM_dd'.txt'");