JSP日期算法 - Chinaunix - Powered by Discuz!

var data = "2009-01-01";
var n = Date.parse(data .replace(/-/g,"/"));
var d = new Date(n);
d.getWeekNew();//日期年中的第几周 (以这年开始的第一天开始算)
d.getWeekNew(true);//日期年中的第几周 (以这年开始的第一个星期一开始算)
d.getDataNew();//日期中在这年的第几天
var fe = getFirstAndEnd(d);
fe.first.format("yyyy-MM-dd");//这周的开始日期
fe.end.format("yyyy-MM-dd");//这周的结束日期
Date.prototype.getWeekNew = function(flag) {
var first = new Date(this.getFullYear(),0,1);
var n = parseInt("1065432".charAt(first.getDay()));
n = this.getTime()-first.getTime()-n*24*60*60*1000;
n = Math.ceil(n/(7*24*60*60*1000));
return (flag==true&&first.getDay()!=1)?(n+1):n;
};
Date.prototype.getDataNew = function() {
var first = new Date(this.getFullYear(),0,1);
var n = parseInt("1065432".charAt(first.getDay()));
var m = n;
n = this.getTime()-first.getTime()-n*24*60*60*1000;
n = Math.ceil(n/(24*60*60*1000));
return (n+m+1);
};
Date.prototype.format = function(format) {
var o = {
"M+" : this.getMonth()+1,//month
"d+" : this.getDate(), //day
"h+" : this.getHours(), //hour
"m+" : this.getMinutes(), //minute
"s+" : this.getSeconds(), //second
"q+" : Math.floor((this.getMonth()+3)/3), //quarter
"S" : this.getMilliseconds() //millisecond
}
if(/(y+)/.test(format)) format=format.replace(RegExp.$1,
(this.getFullYear()+"").substr(4 - RegExp.$1.length));
for(var k in o)if(new RegExp("("+ k +")").test(format))
format = format.replace(RegExp.$1,
RegExp.$1.length==1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
return format;
};
function getFirstAndEnd(d) {
var w = d.getDay(), n = 24*60*60*1000;
var first = new Date(d.getTime() - parseInt("6012345".charAt(w))*n);
var end = new Date(d.getTime() + parseInt("0654321".charAt(w))*n);
return {first: first,end:end};
}

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