JSFiddle - React, Tailwind, and code Playground

JavaScript

var days = ['понедельник', 'вторник', 'среда', 'четверг', 'пятница', 'суббота', 'воскресенье'];
var goBackDays = 7;

$(function() {
    var today = new Date();
    var daysSorted = [];
    
    for(var i = 1; i < goBackDays; i++)
    {
        var newDate = new Date(today.setDate(today.getDate()));
        console.log(newDate);
       
        daysSorted.push(days[newDate.getDay()]);
    }
    
    alert(daysSorted);
 
});