您可以从$wp_query 对象：

if( is_date() ){
    if( isset( $wp_query->query_vars[\'year\'] ) ){
        echo \'queried year is \' . $wp_query->query_vars[\'year\'];
    }
    if( isset( $wp_query->query_vars[\'monthnum\'] ) ){
        echo \'queried month is \' . $wp_query->query_vars[\'monthnum\'];
    }
    if( isset( $wp_query->query_vars[\'day\'] ) ){
        echo \'queried day is \' . $wp_query->query_vars[\'day\'];
    }
}

或者只是通过get_query_var():

echo get_query_var( \'year\' );

这回答了你的问题吗？

EDIT

您可以通过检查permalink结构选项的存在来检查站点是否使用了相当长的permalinks。在这种情况下，您可以获取并解析m 查询变量而不是year / monthnum / day:

if( get_option(\'permalink_structure\') ){
    // using pretty permalinks
} else {
    // not using pretty permalinks
    // note that month or day may be empty
    // test for their existence before trying to use!
    $year = substr( get_query_var( \'m\' ), 0, 4);
    $month = substr( get_query_var( \'m\' ), 4, 2);
    $day = substr( get_query_var( \'m\' ), 6, 2);
}