js-求大神解答 c幣多多 感謝了

求大神解答 c幣多多 感謝了

如圖片一樣 計算倆個日期之間的時間差
並且更改開始時間或截止時間是下方的陰歷開始跟截止同樣改變，改變成同一天
大神幫幫小弟 最好帶注釋 感謝了

 <div class="maincontent">
                        <h2>在線日期計算</h2>

                            <script>//顯示當前日期時間
                                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>小時</span>
                                    <input type="text" class="tet"/><span>分鐘</span>
                                    <input type="text" class="tet"/><span>秒</span>
                                </form>

                            </div>




           </div>

最佳回答：

js陰歷陽歷轉換
http://www.cnblogs.com/zhaoshun/archive/2008/12/24/1361623.html

計算時間將年月日組合成 '2015/12/15'字符串，然後new Date( '2015/12/15')得到日期對象，調用getTime()得到時間戳，兩個時間戳相減得到毫秒，轉換換天小時這種就不用多說了吧