使用JavaScript的上周开始日期和结束日期未提供所需的结果

Question

I am using the following code, but it is returning last week's

start date = 0-4/09/2018 and

end date = 02/09/2018

var curr = new Date;
var first = curr.getDate() - curr.getDay(); 
var last = first + 6; 
var startDate = new Date(curr.setDate(first));
var dd1 = startDate.getDate()-6;
var mm1 = startDate.getMonth() + 1;
if(dd1<10){
     dd1='0'+dd1
} 
if(mm1<10){
     mm1='0'+mm1
}
startDate = "" + dd1 + "/" + mm1 + "/" + startDate.getFullYear();
var endDate = new Date(curr.setDate(last));
var dd2 = endDate.getDate()-6;
var mm2 = endDate.getMonth() + 1;
if(dd2<10){
    dd2='0'+dd2
} 
if(mm2<10){
    mm2='0'+mm2
 }
endDate = "" + dd2 + "/" + mm2 + "/" + endDate.getFullYear();

Answer 1

You have to use the Date object and set its date to the value you like before getting the value. Your implementation is not valid because:

• Type casting missing
• you cannot perform Date().getDate()-6, if the date is 1 you will calculate negative value, so no sense for date.

The correct form is that:

var curr,startDate,endDate, strStartDate,strEndDate;
curr = new Date();
curr.setDate(curr.getDate()+6)

startDate = new Date(curr.getTime());
startDate.setDate(startDate.getDate()-6)

strStartDate = startDate.getDate()+"/"+(startDate.getMonth()+1)+"/"+startDate.getFullYear();


endDate = new Date(startDate.getTime());
endDate.setDate(endDate.getDate()-6);

strEndDate = endDate.getDate()+"/"+(endDate.getMonth()+1)+"/"+endDate.getFullYear();

Answer 2

With a recommendation to use moment.js for date/time manipulation, I offer a solution based on it.

let startDate = moment().endOf("month").startOf("isoWeek");    // Also, check .startOf("week");
let endDate = moment().endOf("month").endOf("isoWeek");    // Also, check .endOf("week");
console.log(start);    // moment object
console.log(start.format('DD-MM-YYYY'));    // date string
console.log(end);    // moment object
console.log(end.format('DD-MM-YYYY'));    // date string