JavaScript 计算日期间距,生日,年龄 _JavaScript

JavaScript 计算日期间隔,生日,年龄

最近些项目的时候被一个小问题难住了.就是javascript计算日期间隔的问题,还有就是生日的计算

下面是从网上搜到的:

新建一个html,把下面的代码贴到html文件里,保存后用浏览器打开

1.下面的这个算法并不精确,有待高手指点.

--------------------------------------------
<Html>

<head>

</head>

<body>

? function btnCount_Click(){

??? s1 = document.getElementById('sdate1').value;

??? s2 = document.getElementById('sdate2').value;

??? DateDiff(s1,s2);

? }

? //计算天数差的函数，通用

? function DateDiff(sDate1, sDate2){? //sDate1和sDate2是2002-12-18格式

??? var aDate, oDate1, oDate2, iDays

??? aDate = sDate1.split("-")

??? oDate1 = new Date(aDate[1] + '-' + aDate[2] + '-' + aDate[0])? //转换为12-18-2002格式

??? aDate = sDate2.split("-")

??? oDate2 = new Date(aDate[1] + '-' + aDate[2] + '-' + aDate[0])

??? iDays = parseInt(Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 /24)? //把相差的毫秒数转换为天数
???
??? month = Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 /24 /30
???
??? year = Math.abs(oDate1 - oDate2) / 1000 / 60 / 60 /24 /365//误差就在这里,这个地方把一年当成了365天

???
??? alert('Day:'+iDays+' Month:'+month+' Years:'+ year +'\nage:' + Math.floor(year));

??? return iDays

? }

</script>

<input type = 'text' id = 'sdate1' />
<br>
<input type = 'text' id = 'sdate2' />
<br>
<button onClick=" btnCount_Click()">第一种计算</button><br>

</body>

--------------------------------------------

下面是第二种计算方法(推荐):

--------------------------------------------

<!-- Begin
function run() {
with (document.agecalc) {
dd = parseInt(day.selectedIndex) + 1;
mm = parseInt(month.selectedIndex) + 1;
yy = year.value;
if (yy.length != 4 || isNaN(yy)) {
document.agecalc.timealive.value = "年份数请输入四位.";
document.agecalc.year.select();
document.agecalc.year.focus();
return;
??? }
}
days = new Date();
gdate = days.getDate();
gmonth = days.getMonth();
gyear = days.getYear();
if (gyear < 2000) gyear += 1900;
age = gyear - yy;
if ((mm == (gmonth + 1)) && (dd <= parseInt(gdate))) {
age = age;
} else {
if (mm <= (gmonth)) {
age = age;
} else {
age = age - 1;
??? }
}
if (age == 0)
age = age;
document.agecalc.timealive.value = "你已经" + age+ " 了 . . .\n\n";
if (mm <= (gmonth + 1))
age = age - 1;
if ((mm == (gmonth + 1)) && (dd > parseInt(gdate)))
age = age + 1;
var m;
var n;
if (mm == 12) n = 31 - dd;
if (mm == 11) n = 61 - dd;
if (mm == 10) n = 92 - dd;
if (mm == 9) n = 122 - dd;
if (mm == 8) n = 153 - dd;
if (mm == 7) n = 184 - dd;
if (mm == 6) n = 214 - dd;
if (mm == 5) n = 245 - dd;
if (mm == 4) n = 275 - dd;
if (mm == 3) n = 306 - dd;
if (mm == 2) { n = 334 - dd; if (leapyear(yy)) n++; }
if (mm == 1) { n = 365 - dd; if (leapyear(yy)) n++; }
if (gmonth == 1) m = 31;
if (gmonth == 2) {
m = 59;
if (leapyear(gyear)) m++;
}
if (gmonth == 3)?? { m = 90;?? if (leapyear(gyear)) m++; }
if (gmonth == 4)?? { m = 120; if (leapyear(gyear)) m++; }
if (gmonth == 5)?? { m = 151; if (leapyear(gyear)) m++; }
if (gmonth == 6)?? { m = 181; if (leapyear(gyear)) m++; }
if (gmonth == 7)?? { m = 212; if (leapyear(gyear)) m++; }
if (gmonth == 8)?? { m = 243; if (leapyear(gyear)) m++; }
if (gmonth == 9)?? { m = 273; if (leapyear(gyear)) m++; }
if (gmonth == 10) { m = 304; if (leapyear(gyear)) m++; }
if (gmonth == 11) { m = 334; if (leapyear(gyear)) m++; }
if (gmonth == 12) { m = 365; if (leapyear(gyear)) m++; }
months = age * 12;
months += 12 - parseInt(mm);
months += gmonth;
totdays = (parseInt(age) * 365);
totdays += age / 4;
totdays = parseInt(totdays) + gdate + m + n;
if (gmonth == 1) p = 31 + gdate;
if (gmonth == 2) {
p = 59 + gdate;
if (leapyear(gyear)) m = m+1;
}
if (gmonth == 3)?? { p = 90 + gdate;?? if (leapyear(gyear)) p++; }
if (gmonth == 4)?? { p = 120 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 5)?? { p = 151 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 6)?? { p = 181 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 7)?? { p = 212 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 8)?? { p = 243 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 9)?? { p = 273 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 10) { p = 304 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 11) { p = 334 + gdate; if (leapyear(gyear)) p++; }
if (gmonth == 12) { p = 365 + gdate; if (leapyear(gyear)) p++; }
weeks = (age * 365) + n + p;
weeks = weeks / 7;
etcdays = parseFloat(weeks) - parseInt(weeks);
etcdays = Math.round(etcdays * 7);
weeks = parseInt(weeks);
etcdays += parseInt(age / 4);
if (etcdays > 7)
weeks += parseInt(etcdays / 7);
document.agecalc.timealive.value += "????? 或者 " + weeks + " 个星期\n";
document.agecalc.timealive.value += "????? 或者 " + months + " 个月\n";
document.agecalc.timealive.value += "????? 或者 " + totdays + " 天\n";
var time = new Date();
ghour = time.getHours();
gmin = time.getMinutes();
gsec = time.getSeconds();
hour = ((age * 365) + n + p) * 24;
hour += (parseInt(age / 4) * 24);
document.agecalc.timealive.value += "????? 或者 " + hour + " 小时了\n";
var min = (hour * 60) + gmin;
document.agecalc.timealive.value += "????? 或者 " + min + " 分了\n";
sec = (min * 60) + gsec;
document.agecalc.timealive.value += "????? 或者 " + sec + " 秒了";
mm = mm - 1;
var r;
if (mm == 0) r = 0;
if (mm == 1) r = 31;
if (mm == 2) { r = 59; if (leapyear(gyear)) m++; }
if (mm == 3)?? { r = 90;?? if (leapyear(gyear)) r++; }
if (mm == 4)?? { r = 120; if (leapyear(gyear)) r++; }
if (mm == 5)?? { r = 151; if (leapyear(gyear)) r++; }
if (mm == 6)?? { r = 181; if (leapyear(gyear)) r++; }
if (mm == 7)?? { r = 212; if (leapyear(gyear)) r++; }
if (mm == 8)?? { r = 243; if (leapyear(gyear)) r++; }
if (mm == 9)?? { r = 273; if (leapyear(gyear)) r++; }
if (mm == 10) { r = 304; if (leapyear(gyear)) r++; }
if (mm == 11) { r = 334; if (leapyear(gyear)) r++; }
mm = mm + 1;
r = parseInt(r) + parseInt(dd);

if ((mm >= (gmonth + 1)) && (dd > gdate)) {
bday = r - m - gdate;
}
else {
if ((leapyear(gyear)) && ((mm > 2) && (dd < 29))) {
a = 366;
} else {
a = 365;
}
bday = a + (r - m - gdate);
}
nhour = 24 - parseInt(ghour);
nmin = 60 - parseInt(gmin);
nsec = 60 - parseInt(gsec);
while (bday > 366) bday -= 365;
if (((bday == 366) && (leapyear(gyear)) || ((bday == 365) && (!leapyear(gyear))))) {
document.agecalc.timealive.value += "\n\n今天是你的生日!";
} else {
document.agecalc.timealive.value += "\n\n你离下一个生日还有:\n"
+ bday + " 天 " + nhour + " 小时 " + nmin + " 分 " + nsec + " 秒";
setTimeout("run()", 1000);
??? }
}
function leapyear(a) {
if (((a%4 == 0) && (a%100 != 0)) || (a%400 == 0))
return true;
else
return false;
}
//?? End -->
</script>

<form name=agecalc>
<table>
<tr><td align=center>
请输入你的生日:?? <select name=month size=1>
<option>一月
<option>二月
<option>三月
<option>四月
<option>五月
<option>六月
<option>七月
<option>八月
<option>九月
<option>十月
<option>十一月
<option>十二月
</select>