Jquery datepicker 时间插件使用 js 时间相加,相减

    $(document).ready(function(){
        //输入框事件
        $('#probation').bind('input propertychange', function() {
            var induction = $("#induction").val();//取出时间
            if (""==induction||null==induction||undefined==induction){
                return alert("请先输入入职日期");
            }
            var addDate =new Date(induction);
            var probation = $("#probation").val();//取出输入值
            var newDate = DateAdd(probation,addDate);
            //初始化值
            $('#inDueForm').val(date_riqi(newDate,0))
        });
        //日期选择事件(此处为转正日期)
        $("#inDueForm").on("hide.uk.datepicker", function (event)
        {
            var init = $(this).val();
            var induction = $("#induction").val();//取出入职时间
            if (""==induction||null==induction||undefined==induction){
                return alert("请先输入入职日期");
            }
            var probation=  DateDiff(init,induction);
            $("#probation").val(probation);//设置试用期输入值
        });
    });

        <div class="uk-form-row">
            <label class="uk-form-label" for="induction">入职时间(必填)</label>
            <div class="uk-form-controls">
                <input name="induction" data-uk-datepicker="{format:'YYYY-MM-DD'}" id="induction" value="" >
            </div>
        </div>
        <div class="uk-form-row">
            <label class="uk-form-label" for="probation">试用期</label>
            <div class="uk-form-controls">
                <input id="probation" name="probation" value=""  placeholder="" type="number">
            </div>
        </div>
        <div class="uk-form-row">
            <label class="uk-form-label" for="inDueForm">转正时间</label>
            <div class="uk-form-controls">
                <input id="inDueForm" data-uk-datepicker="{format:'YYYY-MM-DD'}" name="inDueForm"  value="">
            </div>
        </div>

上面js用到的方法如下:可以放到utils里面

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" alt="" />

//日期格式
function date_riqi(date,flag){
    /**
     *flag =0 返回 yyyy-mm-dd
     *flag =1 返回 yyyy-mm-dd hh:mm:ss
     *flag =2 返回 yyyy-mm-dd hh:mm:ss.ms
     */

    if(typeof(date) == "undefined"){
        return "";
    }
    var date = new Date(date);
    var str_date="";
    var month=(date.getMonth()+1);
    month=month<10?"0"+month:month;
    var day = date.getDate();
    day = day<10?"0"+day:day;
    var hour = date.getHours();
    hour = hour<10?"0"+hour:hour;
    var minutes = date.getMinutes();
    minutes = minutes<10?"0"+minutes:minutes;
    var seconds = date.getSeconds();
    seconds = seconds<10?"0"+seconds:seconds;
    var ms = date.getMilliseconds();
    ms = ms<10?"00"+ms:ms<100?"0"+ms:ms;
    if (flag==0){
        str_date=date.getFullYear()+"-"+month+"-"+day;
    }
    if (flag==1){
        str_date=date.getFullYear()+"-"+month+"-"+day+
            " "+hour+":"+minutes+":"+seconds;
    }
    if (flag==2){date.getMinutes()
        str_date=date.getFullYear()+"-"+month+"-"+day+
            " "+hour+":"+minutes+":"+seconds+"."+ms;
    }
    return str_date;
}
//时间加天
function DateAdd(number, date) {
    date.setDate(date.getDate() + Number(number));
    return date;
}
//返回相差天数
var DateDiff=function (sDate1, sDate2) {  //sDate1和sDate2是yyyy-MM-dd格式

    var aDate, oDate1, oDate2, iDays;
    aDate = sDate1.split("-");
    oDate1 = new Date(aDate[0] + '-' + aDate[1] + '-' + aDate[2]);  //转换为yyyy-MM-dd格式
    aDate = sDate2.split("-");
    oDate2 = new Date(aDate[0] + '-' + aDate[1] + '-' + aDate[2]);
    iDays = parseInt(Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 / 24); //把相差的毫秒数转换为天数

    return iDays;  //返回相差天数
};

当然还要加载插件:(html head)

    <head>
        <title></title>
        <meta charset="UTF-8">
        <script src="https://cdn.bootcss.com/jquery/2.1.3/jquery.js"></script>
        <script src="https://cdn.bootcss.com/jquery/2.1.3/jquery.min.js"></script>
        <script src="https://cdn.bootcss.com/uikit/2.27.2/js/uikit.min.js"></script>
        <link href="https://cdn.bootcss.com/uikit/2.27.2/css/components/datepicker.css" rel="stylesheet">
        <script src="https://cdn.bootcss.com/uikit/2.26.4/js/components/datepicker.js"></script>

    </head>