// 第n年的第n周,获取开始和结束时间 (星期一为一周的开始)
function week_date(weekstr){
let year = weekstr.split("-")[0]
let weekNo = weekstr.split("-")[1]
// 此年1号是星期几
let oneday = new Date(year+'-01-01').getDay() //0-6
// 方便计算,当为星期天时为7
if(oneday==0){
oneday = 7
}
let one_fistday;
let one_lastday;
// 如果1号刚好是星期一
if(oneday == 1){
one_fistday = year+'-01-01'
one_lastday = year+'-01-07'
}else{
let jj = 8-oneday
one_fistday = (year-1)+'-12-'+(31-oneday+2>9?31-oneday+2:'0'+(31-oneday+2))
one_lastday = year+'-01-'+(jj>9?jj:'0'+jj)
}
let fistday;
let lastday;
// 如果刚好是第一周
if(weekNo ==1){
fistday = one_fistday
lastday = one_lastday
}else{
fistday = addDate(one_lastday,(weekNo-2)*7+1)
lastday = addDate(one_lastday,(weekNo-1)*7)
}
return [fistday,lastday]
}
//日期加减法 date参数为计算开始的日期,days为需要加的天数
//格式:addDate('2017-1-11',20)
function addDate(date,days){
var d=new Date(date);
d.setDate(d.getDate()+days);
var m=d.getMonth()+1;
return d.getFullYear()+'-'+(m>9?m:'0'+m)+'-'+(d.getDate()>9?d.getDate():'0'+d.getDate());
}
js 根据n年第n周,获取此周的开始和结束日期
程序员文章站
2022-06-07 11:53:09
...
上一篇: oracle存储过程初入门示例
下一篇: 赋值和初始化