Date in File Name: Difference between revisions
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{{ | {{LangSwitch}} | ||
[[Category:HowTo]] | [[Category:HowTo]] | ||
[[Category:snippets]] | [[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. | 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> | ||
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" ); | |||
}</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> | ||
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; | 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> |
Latest revision as of 13:39, 28 June 2015
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'");