<script type="text/javascript">
function reDate(a, b, c) {
var date = new Date(a, b - 1, c);
return Math.ceil((c + 7 - (date.getDay() || 7)) / 7);
}
alert(reDate(2007, 3, 4));
</script>
function reDate(a, b, c) {
var date = new Date(a, b - 1, c);
return Math.ceil((c + 7 - (date.getDay() || 7)) / 7);
}
alert(reDate(2007, 3, 4));
</script>
{
var date = new Date(a, b - 1, c);
var date2 =new Date(a, b - 1, 1);
return Math.ceil((c+date2.getDay())/7);
//return Math.ceil((c + 7 - (date.getDay()+1 || 7)) / 7);
}
alert(reDate(2007, 4, 29));
<!--
Date.prototype.getWeek = 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;
};
alert("今天是今年的第 "+ new Date().getWeek() +" 周\n本年第一周周一在上一年的情况")
alert("今天是今年的第 "+ new Date().getWeek(true) +" 周")
alert("2006/10/1 是第 "+ new Date("2006/10/1").getWeek(true) +" 周")
//-->
</SCRIPT>
var getMonthWeek = function (a, b, c) {
/*
a = d = 当前日期
b = 6 - w = 当前周的还有几天过完(不算今天)
a + b 的和在除以7 就是当天是当前月份的第几周
*/
var date = new Date(a, parseInt(b) - 1, c), w = date.getDay(), d = date.getDate();
return Math.ceil(
(d + 6 - w) / 7
);
};var getYearWeek = function (a, b, c) {
/*
date1是当前日期
date2是当年第一天
d是当前日期是今年第多少天
用d + 当前年的第一天的周差距的和在除以7就是本年第几周
*/
var date1 = new Date(a, parseInt(b) - 1, c), date2 = new Date(a, 0, 1),
d = Math.round((date1.valueOf() - date2.valueOf()) / 86400000);
return Math.ceil(
(d + ((date2.getDay() + 1) - 1)) / 7
);
};document.write(
"今天是本月的第 ", getMonthWeek(2007, 10, 17), " 周<br \/>"
, "今天是本年的第 ", getYearWeek(2007, 10, 17), " 周"
);
</script>