日期加减

最新推荐文章于 2024-09-02 09:54:14 发布

原创最新推荐文章于 2024-09-02 09:54:14 发布 · 371 阅读

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#date #function

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本文介绍了一个JavaScript函数，该函数能够根据传入的日期字符串及指定的天数进行日期加减运算，并确保输出的日期格式统一为YYYY年MM月DD日的形式。

/* * 根据传入日期，要处理的天数，进行加/减计算。 * 日期格式：XXXX年XX月XX日 */ function addByTransDate(dateParameter, num) { var translateDate = "", dateString = "", monthString = "", dayString = ""; translateDate = dateParameter.replace("-", "/").replace("-", "/");; var newDate = new Date(translateDate); newDate = newDate.valueOf(); newDate = newDate + num * 24 * 60 * 60 * 1000; newDate = new Date(newDate); //如果月份长度少于2，则前加 0 补位 if ((newDate.getMonth() + 1).toString().length == 1) { monthString = 0 + "" + (newDate.getMonth() + 1).toString(); alert(translateDate); } else { monthString = (newDate.getMonth() + 1).toString(); alert(translateDate); } //如果天数长度少于2，则前加 0 补位 if (newDate.getDate().toString().length == 1) { dayString = 0 + "" + newDate.getDate().toString(); } else { dayString = newDate.getDate().toString(); } dateString = newDate.getFullYear() + "-" + monthString + "-" + dayString; return dateString; } function reduceByTransDate(dateParameter, num) { var translateDate = "", dateString = "", monthString = "", dayString = ""; translateDate = dateParameter.replace("-", "/").replace("-", "/");; var newDate = new Date(translateDate); newDate = newDate.valueOf(); newDate = newDate - num * 24 * 60 * 60 * 1000; newDate = new Date(newDate); //如果月份长度少于2，则前加 0 补位 if ((newDate.getMonth() + 1).toString().length == 1) { monthString = 0 + "" + (newDate.getMonth() + 1).toString(); alert(translateDate); } else { monthString = (newDate.getMonth() + 1).toString(); alert(translateDate); } //如果天数长度少于2，则前加 0 补位 if (newDate.getDate().toString().length == 1) { dayString = 0 + "" + newDate.getDate().toString(); } else { dayString = newDate.getDate().toString(); } dateString = newDate.getFullYear() + "-" + monthString + "-" + dayString; return dateString; }