虽然，在我的wp中echo 正确显示（因此可能需要再次检查您是否使用了正确的区域设置，以及“拒绝月份名称：开或关”在您的区域设置中是否翻译为“开”），您可以通过基于wp_maybe_decline_date().

为了克服wp_maybe_decline_date() 正则表达式，匹配以下格式\'j F Y\' 或\'j. F\', 当我想使用\'l j F Y\'

示例用例：

在我们的主题中functions.php 我们定义包装函数如下：

/**
 * [multi_force_use_genitive_month_date]
 * Call this to force genitive use case for months in date translation
 * @param  string $date Formatted date string.
 * @return string The date, declined if locale specifies it.
 */
function multi_force_use_genitive_month_date( $date ) {
    global $wp_locale;

    // i18n functions are not available in SHORTINIT mode
    if ( ! function_exists( \'_x\' ) ) {
        return $date;
    }

    /* translators: If months in your language require a genitive case,
     * translate this to \'on\'. Do not translate into your own language.
     */
    if ( \'on\' === _x( \'off\', \'decline months names: on or off\' ) ) {
        // Match a format like \'j F Y\' or \'j. F\'
        $months          = $wp_locale->month;
        $months_genitive = $wp_locale->month_genitive;

        foreach ( $months as $key => $month ) {
            $months[ $key ] = \'# \' . $month . \'( |$)#u\';
        }

        foreach ( $months_genitive as $key => $month ) {
            $months_genitive[ $key ] = \' \' . $month . \'$1\';
        }

        $date = preg_replace( $months, $months_genitive, $date );
    }

    // Used for locale-specific rules
    $locale = get_locale();

    return $date;
}

<?php echo multi_force_use_genitive_month_date( date_i18n( \'l j F Y\' ) ); ?>

基于@Cubakos的代码更新的工作版本：

function multi_force_use_genitive_month_date( $date ) {
   global $wp_locale;

   $months          = $wp_locale->month;
   $months_genitive = $wp_locale->month_genitive;

   $date = str_replace( $months, $months_genitive, $date );

   return $date;
}

<?= multi_force_use_genitive_month_date(get_the_date()); ?>