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js 日期 比較相差天數,日期格式化,

<html>
<body>
    <input type="text" id="start_Time"  value="2014-1-22"   />
    <input type="text" id="end_Time"    value="2014-02-22"  />
    
    <script type="text/javascript" src="jquery.min.js"></script>
   
    <script type="text/javascript">
        function checkdata() 

       {

            var date1 = Date.parse($('#start_Time').val());

            var date2 = Date.parse($('#end_Time').val());

            var diffDays = (date2 - date1) / 3600 / 1000 / 24;

            if (diffDays > 7) 

          {

                    var myDate = new Date(date1);

                    myDate.setDate(myDate.getDate() + 7);

                    var month = myDate.getMonth() + 1;
                    month = month > 9 ? month : "0" + month;

                    var day = myDate.getDate()  ;
                    day = day > 9 ? day : "0" + day;
                  
                    $("#end_Time").val("" + myDate.getFullYear() + "-" + month + "-" + day + "");               
                
           }
        }
    </script>

</body>
</html>