JS日期比较大小 给定时间和持续时间计算最终时间

   /* 往指定时间字符串上加时间间隔，获得新的时间字符串

 * startDateStr：开始时间字符串，类似"2015-7-20 17:26:00"

 * durationNumStr：持续时间数

 * durationTypeStr：持续时间类型

 * 返回类似：2015-7-20 17:26:00

 *

 *

 */

function getEndDate(startDateStr, durationNumStr, durationTypeStr) {

 

    var startDate = new Date(startDateStr.replace("-", "/").replace("-",

            "/"));

    var duration_num = parseInt(durationNumStr);

 

    var endDate = "";

    if (durationTypeStr == "min") {

        endDate = new Date(startDate.setMinutes(startDate.getMinutes()

                + duration_num));

    }

    if (durationTypeStr == "h") {

        endDate = new Date(startDate.setHours(startDate.getHours()

                + duration_num));

    }

    if (durationTypeStr == "d") {

        endDate = new Date(startDate.setDate(startDate.getDate()

                + duration_num));

    }

    if (durationTypeStr == "w") {

        endDate = new Date(startDate.setDate(startDate.getDate()

                + duration_num * 7));

    }

    if (durationTypeStr == "m") {

        endDate = new Date(startDate.setMonth(startDate.getMonth()

                + duration_num));

    }

    if (durationTypeStr == "y") {

        endDate = new Date(startDate.setFullYear(startDate.getFullYear()

                + duration_num));

    }

 

    var year = endDate.getFullYear();

    var month = endDate.getMonth() + 1 < 10 ? "0"

            + (endDate.getMonth() + 1) : endDate.getMonth() + 1;

    var date = endDate.getDate() < 10 ? "0" + endDate.getDate() : endDate

            .getDate();

    var hour = endDate.getHours() < 10 ? "0" + endDate.getHours() : endDate

            .getHours();

    var minute = endDate.getMinutes() < 10 ? "0" + endDate.getMinutes()

            : endDate.getMinutes();

    var second = endDate.getSeconds() < 10 ? "0" + endDate.getSeconds()

            : endDate.getSeconds();

    var endDateStr = year + "-" + month + "-" + date + " " + hour + ":"

            + minute + ":" + second;

    return endDateStr;

}

 

/**

 * 计算开始时间是否小于结束时间，小于等于返回true，否则false

 * startDateStr：开始时间字符串

 * endDateStr：结束时间字符串

 * 返回：true或false

 *

 *

 */

function chkTime(startDateStr, endDateStr) {

    //计划截止时间

    var startDate = new Date(startDateStr.replace("-", "/").replace("-",

            "/"));

    //计划详细项的截止时间

    var endDate = new Date(endDateStr.replace("-", "/").replace("-", "/"));

    if (startDate <= endDate) {

        return true;

    } else {

        return false;

    }

}