JS计算从某年某月某日到某年某月某日的间隔天数差

直接贴代码了，你直接拷贝然后另存为html就可以用了，不多说，请看：

<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml"><head> <meta charset="utf-8" /> <title></title> <script type="text/javascript"> function lookup() { var d = parseFloat(document.form1.date1.value);// read date from form var m = parseFloat(document.form1.month1.value);// read month value from form var y = parseFloat(document.form1.year1.value);// read year from form var a = Math.floor(y / 100); var b = 2 - a + Math.floor(a / 4);

if (m < 3) { var y = y - 1; var m = m + 12; }

jd1 = eval(Math.floor(365.25 * (y + 4716)) + Math.floor(30.6001 * (m + 1)) + d + b - 1524);

var d = parseFloat(document.form1.date2.value);// read date from form var m = parseFloat(document.form1.month2.value);// read month value from form var y = parseFloat(document.form1.year2.value);// read year from form

if (m < 3) { var y = y - 1; var m = m + 12; } jd2 = eval(Math.floor(365.25 * (y + 4716)) + Math.floor(30.6001 * (m + 1)) + d + b - 1524);

document.form1.answer.value = eval(Math.abs(jd1 - jd2));

} </script></head><body> <form name="form1"> <font color="#F9F9F9"> 计算时间天数

</font>

<table cellpadding="5" align="middle" border="5"> <tbody> <tr bgcolor="#b6d4d2">  <td colspan="3" bgcolor="#c3c3c3"> <center> <font color="#FFFFFF"> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular"> 日期 </font>天数计算器在线使用 </font> </center> </td> </tr>  <tr bgcolor="#c3c3c3"> <td align="middle" colspan="3" height="33" bgcolor="#c3c3c3"> <font face="Arial,Helvetica,Geneva,Swiss,SunSans-Regular" color="#FFFFFF"> 所需<a href="#" style="text-decoration: none"><font color="#FFFFFF">的数据</font></a>录入-日期相差天数 </font> </td> </tr> <tr> <td>从日期</td> <td><select size="1" name="date1"> <option value="1" selected="" select="">1</option><option value="2">2</option><option value="3">3</option><option value="4">4</option><option value="5">5</option><option value="6">6</option><option value="7">7</option><option value="8">8</option><option value="9">9</option><option value="10">10</option><option value="11">11</option><option value="12">12</option><option value="13">13</option><option value="14">14</option><option value="15">15</option><option value="16">16</option><option value="17">17</option><option value="18">18</option><option value="19">19</option><option value="20">20</option><option value="21">21</option><option value="22">22</option><option value="23">23</option><option value="24">24</option><option value="25">25</option><option value="26">26</option><option value="27">27</option><option value="28">28</option><option value="29">29</option><option value="30">30</option><option value="31">31</option></select> <select size="1" name="month1"> <option value="1" selected="">一月</option><option value="2">二月</option><option value="3">三月</option><option value="4">四月</option><option value="5">五月</option><option value="6">六月</option><option value="7">七月</option><option value="8">八月</option><option value="9">九月</option><option value="10">十月</option><option value="11">十一月</option><option value="12">十二月</option></select> </td> <td> <select size="1" name="year1" type="text"> <option value="1970">1970</option> <option value="1971">1971</option> <option value="1972">1972</option> <option value="1973">1973</option> <option value="1974">1974</option> <option value="1975">1975</option> <option value="1976">1976</option> <option value="1977">1977</option> <option value="1978">1978</option> <option value="1979">1979</option> <option value="1980">1980</option> <option value="1981">1981</option> <option value="1982">1982</option> <option value="1983">1983</option> <option value="1984">1984</option> <option value="1985">1985</option> <option value="1986">1986</option> <option value="1987">1987</option> <option value="1988">1988</option> <option value="1989">1989</option> <option value="1990">1990</option> <option value="1991" selected="selected">1991</option> <option value="1992">1992</option> <option value="1993">1993</option> <option value="1994">1994</option> <option value="1995">1995</option> <option value="1996">1996</option> <option value="1997">1997</option> <option value="1998">1998</option> <option value="1999">1999</option> <option value="2000">2000</option> <option value="2001">2001</option> <option value="2002">2002</option> <option value="2003">2003</option> <option value="2004">2004</option> <option value="2005">2

JS计算从某年某月某日到某年某月某日的间隔天数差

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