jQuery计算日期时间差和同步

如图片一样 计算俩个日期之间的时间差
并且更改开始时间或截止时间是下方的阴历开始跟截止同样改变，改变成同一天

大神帮帮小弟 最好带注释 感谢了

 <div class="maincontent">
                        <h2>在线日期计算</h2>

                            <script>//显示当前日期时间
                                setInterval("jnkc.innerHTML=new Date().toLocaleString()+'星期'+'日一二三四五六'.charAt(new Date().getDay());",1000);
                            </script>


                            <div id="t1">

                                <p class="today">今天是</p><label id="jnkc" ></label> 
                                <div class="sj" ><span class="qz">起止</span><span class="jz">截止</span></div>
                                <form name="reg_testdate" method="post" class="date">
                                   <select name="YYYY" onChange="YYYYDD(this.value)"></select><span>年</span>
                                    <select name="MM" onChange="MMDD(this.value)"> </select><span>月</span>
                                    <select name="DD" ></select><span>日</span>

                                </form>
                                <form name="reg_testdate4" method="post" class="date4">
                                    <select name="YYYY4" onChange="YYYYDD4(this.value)"></select><span>年</span>
                                    <select name="MM4" onChange="MMDD4(this.value)"> </select><span>月</span>
                                    <select name="DD4" ></select><span>日</span>

                                </form>
                                <form name="reg_testdate1" method="post" class="date1">
                                   <select name="YYYY1" onChange="YYYYDD1(this.value)"></select><span>年</span>
                                    <select name="MM1" onChange="MMDD1(this.value)"> </select><span>月</span>
                                    <select name="DD1" ></select>
                                </form>
                               <form name="reg_testdate3" method="post" class="date3">
                                    <select name="YYYY3" onChange="YYYYDD3(this.value)"></select><span>年</span>
                                    <select name="MM3" onChange="MMDD3(this.value)"> </select><span>月</span>
                                    <select name="DD3" ></select>
                                </form>

                                <form name="reg_testdate2" id="jg" class="date2">

                                    <input type="text" class="tet" onChange="YYYYDD2(this.value)"/><span>年</span>
                                    <input type="text" class="tet" onChange="MMDD2(this.value)"/><span>月</span>
                                    <input type="text" class="tet"/><span>周</span>
                                    <input type="text" class="tet"/><span>日</span>
                                    <input type="text" class="tet"/><span>小时</span>
                                    <input type="text" class="tet"/><span>分钟</span>
                                    <input type="text" class="tet"/><span>秒</span>
                                </form>

                            </div>




           </div>

var date1 = new Date(2012, 4, 7, 11, 27); //开始时间 var date2 = new Date(2012, 4, 7, 12, 28); //结束时间 var date3 = date2.getTime() - date1.getTime(); //时间差的毫秒数 //计算相差的年数 var years = Math.floor(date3 / (12 * 30 * 24 * 3600 * 1000)); //计算相差的月数 var leave = date3 % (12 * 30 * 24 * 3600 * 1000); var months = Math.floor(leave / (30 * 24 * 3600 * 1000)); //计算出相差天数 var leave0 = leave % (30 * 24 * 3600 * 1000); var days = Math.floor(leave0 / (24 * 3600 * 1000)); //计算出小时数 var leave1 = leave0 % (24 * 3600 * 1000); //计算天数后剩余的毫秒数 var hours = Math.floor(leave1 / (3600 * 1000)); //计算相差分钟数 var leave2 = leave1 % (3600 * 1000); //计算小时数后剩余的毫秒数 var minutes = Math.floor(leave2 / (60 * 1000)); //计算相差秒数 var leave3 = leave2 % (60 * 1000); //计算分钟数后剩余的毫秒数 var seconds = Math.round(leave3 / 1000); document.write(" 相差 " + years + "年" + months + "月" + days + "天 " + hours + "小时 " + minutes + " 分钟" + seconds + " 秒")var date1 = new Date(2012, 4, 7, 11, 27); //开始时间 var date2 = new Date(2012, 4, 7, 12, 28); //结束时间 var date3 = date2.getTime() - date1.getTime(); //时间差的毫秒数 //计算相差的年数 var years = Math.floor(date3 / (12 * 30 * 24 * 3600 * 1000)); //计算相差的月数 var leave = date3 % (12 * 30 * 24 * 3600 * 1000); var months = Math.floor(leave / (30 * 24 * 3600 * 1000)); //计算出相差天数 var leave0 = leave % (30 * 24 * 3600 * 1000); var days = Math.floor(leave0 / (24 * 3600 * 1000)); //计算出小时数 var leave1 = leave0 % (24 * 3600 * 1000); //计算天数后剩余的毫秒数 var hours = Math.floor(leave1 / (3600 * 1000)); //计算相差分钟数 var leave2 = leave1 % (3600 * 1000); //计算小时数后剩余的毫秒数 var minutes = Math.floor(leave2 / (60 * 1000)); //计算相差秒数 var leave3 = leave2 % (60 * 1000); //计算分钟数后剩余的毫秒数 var seconds = Math.round(leave3 / 1000); document.write(" 相差 " + years + "年" + months + "月" + days + "天 " + hours + "小时 " + minutes + " 分钟" + seconds + " 秒")

醉了，评论发多一条，也没法删掉，CSDN功能欠缺