从星期日开始工作日 - javascript

Question

I want to retrieve a date by providing day number of a specific week

Eg

When I say

day: 1

It should provide me:

2023-01-15

What I have tried so far is:

 function calculatedDate (day){ let date = new Date(); let dayAtDate = date.getDay(); let dayDiff = day - dayAtDate; if(dayDiff < 0){ dayDiff = 7 + dayDiff; } let desiredDate = date.setDate(date.getDate() + dayDiff); return new Date(desiredDate); } console.log(calculatedDate(1));

Now the problem with above code is that it considers day: 1 as monday, but I want day: 1 to be sunday here.

Can anyone help me with the best possible way here?

Answer 1

Sunday is 0, Monday is 1 here:

 function calculatedDate (day) { let date = new Date(); let dayAtDate = date.getDay(); let dayDiff = day - (dayAtDate + 1); // change here if (dayDiff < 0) { dayDiff = 7 + dayDiff; } let desiredDate = date.setDate(date.getDate() + dayDiff); return new Date(desiredDate); } console.log(calculatedDate(1));

Answer 2

How about just -1 the provided day? that should solve it:

 function calculatedDate (day){ let date = new Date(); let dayAtDate = date.getDay(); day = day - 1; let dayDiff = day - dayAtDate; if(dayDiff < 0){ dayDiff = 7 + dayDiff; } let desiredDate = date.setDate(date.getDate() + dayDiff); return new Date(desiredDate); } console.log(calculatedDate(1));

You'd probably want to add some validation on the input parameter day , make sure it's a number and 1 or greater.

Answer 3

The current day will be 0, account for this by making the following change.

if(dayDiff < 0){
    dayDiff = 6 + dayDiff;
}