Active class with custom wp_get_archives HTML output

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I haven’t found an easy way but here is a solution:

I get the month and year from the current archive and compare them with the text.

$year      = get_query_var( 'year' );
$monthnum  = get_query_var( 'monthnum' );
$monthname = $GLOBALS['wp_locale']->get_month( $monthnum );
$date      = $monthname . ' ' . $year;

if ( $text === $date )
$active_class="class="current-menu-item"";