I want to print something like this (a 7-day calendar) but with the ability to start from any date I want.

Monday, 1 January 2011
Tuesday, 2 January 2011
Wednesday, 3 January 2011
Thursday, 4 January 2011
Friday, 5 January 2011
Saturday, 6 January 2011
Sunday, 7 January 2011

So for example I want to show next seven days from 22 of February. Have no idea how to handle this.

• javascript
• date
• calendar

This seems to be what you're looking for:

function GetDates(startDate, daysToAdd) {
    var aryDates = [];

    for (var i = 0; i <= daysToAdd; i++) {
        var currentDate = new Date();
        currentDate.setDate(startDate.getDate() + i);
        aryDates.push(DayAsString(currentDate.getDay()) + ", " + currentDate.getDate() + " " + MonthAsString(currentDate.getMonth()) + " " + currentDate.getFullYear());
    }

    return aryDates;
}

function MonthAsString(monthIndex) {
    var d = new Date();
    var month = new Array();
    month[0] = "January";
    month[1] = "February";
    month[2] = "March";
    month[3] = "April";
    month[4] = "May";
    month[5] = "June";
    month[6] = "July";
    month[7] = "August";
    month[8] = "September";
    month[9] = "October";
    month[10] = "November";
    month[11] = "December";

    return month[monthIndex];
}

function DayAsString(dayIndex) {
    var weekdays = new Array(7);
    weekdays[0] = "Sunday";
    weekdays[1] = "Monday";
    weekdays[2] = "Tuesday";
    weekdays[3] = "Wednesday";
    weekdays[4] = "Thursday";
    weekdays[5] = "Friday";
    weekdays[6] = "Saturday";

    return weekdays[dayIndex];
}

var startDate = new Date();
var aryDates = GetDates(startDate, 7);
console.log(aryDates);​
​

Result (as of today):

["Thursday, 5 April 2012",
 "Friday, 6 April 2012", 
 "Saturday, 7 April 2012", 
 "Sunday, 8 April 2012", 
 "Monday, 9 April 2012", 
 "Tuesday, 10 April 2012", 
 "Wednesday, 11 April 2012", 
 "Thursday, 12 April 2012"]

Here's a working fiddle.

An initial date:

var startingDay = new Date(year, month, day);

A whole week from startingDay:

var thisDay = new Date();
for(var i=0; i<7; i++) {
  thisDay.setDate(startingDay.getDate() + i);
  console.log(thisDay.format());
}

The formatting function:

Date.prototype.format = function(){
    var months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];        
    var days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
    return days[this.getDay()]
          +", "
          +this.getDate()
          +" "
          +months[this.getMonth()] 
          +" "
          +this.getFullYear();
};

Here is my solution using Moment.js

Next 7 days

let days = [];
let daysRequired = 7

for (let i = 1; i <= daysRequired; i++) {
  days.push( moment().add(i, 'days').format('dddd, Do MMMM YYYY') )
}

console.log(days)

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>

Just in case if you need previous 7 days

let days = [];
let daysRequired = 7

for (let i = daysRequired; i >= 1; i--) {
  days.push( moment().subtract(i, 'days').format('dddd, Do MMMM YYYY') )
}

console.log(days)

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>

var feb22 = new Date(2012, 1, 22);
var feb23 = new Date(feb22.getTime() + 1000*60*60*24);

...and so on

You can set the variable dateString to whatever you want and in the loop you just increase the day. Then you will get the dates, but I think in a different format.

var dateString = '22 Feb 2012';
var actualDate = new Date(dateString);
var newDate;

for(var i=1; i<=7; i++){
 newDate = new Date(actualDate.getFullYear(), actualDate.getMonth(), actualDate.getDate()+i);
}

If you need next 7 weekdays starting from today

const isWeekday = (date) => {
 return date.weekday()!==0 && date.weekday()!==6
}

const weekdays=[];
let numberOfDaysRequired = 7
let addDaysBy = 1
moment.locale('en')
while(weekdays.length < numberOfDaysRequired)
{
  const d = moment().add(addDaysBy, 'days')
  if(isWeekday(d))
  {
   weekdays.push(d.format('dddd, Do MMMM YYYY'))
   
  }
  addDaysBy++;
}

console.log(weekdays)

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>