Difference between revisions of "Date in File Name"

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m (Wieland moved page Date-in-File-Name to Date in File Name: underscores)
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[[Category:HowTo]]
 
[[Category:HowTo]]
 
[[Category:snippets]]
 
[[Category:snippets]]
 
'''English''' | [[Date-in-File-Name-Russian|Русский]]
 
 
= Date in File Name =
 
 
 
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.
 
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(){
+
<code>
QDate today = QDate::currentDate();
+
QString FileNameHandler::todayFileName() {
QString relativeFileName( "data_" );
+
    QDate today = QDate::currentDate();
relativeFileName.append( QString::number( today.month() ) );
+
    QString relativeFileName( "data_" );
relativeFileName.append( "''" );
+
    relativeFileName.append( QString::number( today.month() ) );
relativeFileName.append( QString::number( today.day() ) );
+
    relativeFileName.append( "''" );
relativeFileName.append( "''" );
+
    relativeFileName.append( QString::number( today.day() ) );
relativeFileName.append( QString::number( today.year() ) );
+
    relativeFileName.append( "''" );
relativeFileName.append( ".txt" );
+
    relativeFileName.append( QString::number( today.year() ) );
return relativeFileName;
+
    relativeFileName.append( ".txt" );
}</code>
+
    return relativeFileName;
 +
}
 +
</code>
  
 
Or its shorter version that uses the overloading of the + operator for QString:
 
Or its shorter version that uses the overloading of the + operator for QString:
  
<code>QString FileNameHandler::todayFileName(){
+
<code>
QDate today = QDate::currentDate();
+
QString FileNameHandler::todayFileName() {
QString relativeFileName( "data_" );
+
    QDate today = QDate::currentDate();
relativeFileName + QString::number( today.month()
+
    QString relativeFileName( "data_" );
+ "''" + QString::number( today.day() )
+
    relativeFileName + QString::number( today.month()
+ "''" + QString::number( today.year() )
+
        + "''" + QString::number( today.day() )
+ ".txt";
+
        + "''" + QString::number( today.year() )
 
+
        + ".txt";
return relativeFileName;
+
    return relativeFileName;
}</code>
+
}
 +
</code>
  
 
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>
+
<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
  
</code>QString filename = QDate::currentDate().toString("'data_'yyyy_MM_dd'.txt'");</code>
+
<code>
 +
QString filename = QDate::currentDate().toString("'data_'yyyy_MM_dd'.txt'");
 +
</code>

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'");