2008年日历源码

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日期计算
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//====================================== 返回农历 y年的总天数
function lYearDays(y) {
var i, sum = 348;
for(i=0x8000; i>0x8; i>>=1) sum += (lunarInfo[y-1900] & i)? 1: 0;
return(sum+leapDays(y));
}

//====================================== 返回农历 y年闰月的天数
function leapDays(y) {
if(leapMonth(y)) return((lunarInfo[y-1900] & 0x10000)? 30: 29);
else return(0);
}

//====================================== 返回农历 y年闰哪个月 1-12 , 没闰返回 0
function leapMonth(y) {
return(lunarInfo[y-1900] & 0xf);
}

//====================================== 返回农历 y年m月的总天数
function monthDays(y,m) {
return( (lunarInfo[y-1900] & (0x10000>>m))? 30: 29 );
}

//====================================== 算出农历, 传入日期控件, 返回农历日期控件
// 该控件属性有 .year .month .day .isLeap
function Lunar(objDate) {

var i, leap=0, temp=0;
var offset = (Date.UTC(objDate.getFullYear(),objDate.getMonth(),objDate.getDate()) - Date.UTC(1900,0,31))/86400000;

for(i=1900; i<2050 && offset>0; i++) { temp=lYearDays(i); offset-=temp; }

if(offset<0) { offset+=temp; i--; }

this.year = i;

leap = leapMonth(i); //闰哪个月
this.isLeap = false;

for(i=1; i<13 && offset>0; i++) {
//闰月
if(leap>0 && i==(leap+1) && this.isLeap==false)
{ --i; this.isLeap = true; temp = leapDays(this.year); }
else
{ temp = monthDays(this.year, i); }

//解除闰月
if(this.isLeap==true && i==(leap+1)) this.isLeap = false;

offset -= temp;
}

if(offset==0 && leap>0 && i==leap+1)
if(this.isLeap)
{ this.isLeap = false; }
else
{ this.isLeap = true; --i; }

if(offset<0){ offset += temp; --i; }

this.month = i;
this.day = offset + 1;
}

//==============================返回公历 y年某m+1月的天数
function solarDays(y,m) {
if(m==1)
return(((y%4 == 0) && (y%100 != 0) || (y%400 == 0))? 29: 28);
else
return(solarMonth[m]);
}
//============================== 传入 offset 返回干支, 0=甲子
function cyclical(num) {
return(Gan[num%10]+Zhi[num%12]);
}

//============================== 阴历属性
function calElement(sYear,sMonth,sDay,week,lYear,lMonth,lDay,isLeap,cYear,cMonth,cDay) {

this.isToday = false;
//瓣句
this.sYear = sYear; //公元年4位数字
this.sMonth = sMonth; //公元月数字
this.sDay = sDay; //公元日数字
this.week = week; //星期, 1个中文
//农历
this.lYear = lYear; //公元年4位数字
this.lMonth = lMonth; //农历月数字
this.lDay = lDay; //农历日数字
this.isLeap = isLeap; //是否为农历闰月?
//八字
this.cYear = cYear; //年柱, 2个中文
this.cMonth = cMonth; //月柱, 2个中文
this.cDay = cDay; //日柱, 2个中文

this.color = '';

this.lunarFestival = ''; //农历节日
this.solarFestival = ''; //公历节日
this.solarTerms = ''; //节气
}

//===== 某年的第n个节气为几日(从0小寒起算)
function sTerm(y,n) {
var offDate = new Date( ( 31556925974.7*(y-1900) + sTermInfo[n]*60000 ) + Date.UTC(1900,0,6,2,5) );
return(offDate.getUTCDate());
}