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function applyBlackAndWhiteFilterOnDate(targetDate) {
    var currentDate = new Date();
    var targetMonth = targetDate.split("-")[0];
    var targetDay = targetDate.split("-")[1];

    // 检查当前日期是否与目标日期相等
    if (
        currentDate.getMonth() + 1 === parseInt(targetMonth) &&
        currentDate.getDate() === parseInt(targetDay)
    ) {
        // 将整个 HTML 页面设置为黑白滤镜
        document.documentElement.style.filter = "grayscale(100%)";
    }
}

applyBlackAndWhiteFilterOnDate("12-31");