Get Weeks in Month Through JavaScript

Get Weeks In Month Through Javascript

Weeks start on Sunday

This ought to work even when February doesn't start on Sunday.

function weekCount(year, month_number) {

    // month_number is in the range 1..12

    var firstOfMonth = new Date(year, month_number-1, 1);
    var lastOfMonth = new Date(year, month_number, 0);

    var used = firstOfMonth.getDay() + lastOfMonth.getDate();

    return Math.ceil( used / 7);
}

Weeks start on Monday

function weekCount(year, month_number) {

    // month_number is in the range 1..12

    var firstOfMonth = new Date(year, month_number-1, 1);
    var lastOfMonth = new Date(year, month_number, 0);

    var used = firstOfMonth.getDay() + 6 + lastOfMonth.getDate();

    return Math.ceil( used / 7);
}

Weeks start another day

function weekCount(year, month_number, startDayOfWeek) {
  // month_number is in the range 1..12

  // Get the first day of week week day (0: Sunday, 1: Monday, ...)
  var firstDayOfWeek = startDayOfWeek || 0;

  var firstOfMonth = new Date(year, month_number-1, 1);
  var lastOfMonth = new Date(year, month_number, 0);
  var numberOfDaysInMonth = lastOfMonth.getDate();
  var firstWeekDay = (firstOfMonth.getDay() - firstDayOfWeek + 7) % 7;

  var used = firstWeekDay + numberOfDaysInMonth;

  return Math.ceil( used / 7);
}

Getting current week of current month

The ISO week in month number is based on Mondays, so Thursday, 2 March 2017 is in week 4 of February 2017 and Monday 6 March 2017 is in week 1 of March.

So the algorithm is to move to the previous Monday and see which Monday of the month it is. I would have thought this was a duplicate but I can't find one, so here's a function.

/* Get ISO week in month, based on first Monday in month
** @param {Date} date - date to get week in month of
** @returns {Object} month: month that week is in
**                   week: week in month
*/
function getISOWeekInMonth(date) {
  // Copy date so don't affect original
  var d = new Date(+date);
  if (isNaN(d)) return;
  // Move to previous Monday
  d.setDate(d.getDate() - d.getDay() + 1);
  // Week number is ceil date/7
  return {month: +d.getMonth()+1,
          week: Math.ceil(d.getDate()/7)};
}
//*
[new Date(2017,2,2),   // Thu 2 Mar 2017
 new Date(2017,2,6),   // Mon 6 Mar 2017
 new Date(2017,4,31),  // Wed 31 May 2017
 new Date()].forEach(  // Current date
  function(date) {
    console.log(date.toString() + '\nis in week ' +
    getISOWeekInMonth(date).week + ' of month ' +
    getISOWeekInMonth(date).month);
  }
);
//*/

how to get weeks in particular month with dates in java script

This works.

var date = new Date();console.log("All Weeks : ", getWeeksInaMonth())console.log("Current Week : ", getCurrentWeek())console.log("Current and previous weeks : ",getCurrAndPrevWeeks())
function getFormattedDate(dateobj){    var date = dateobj.getDate(), month = dateobj.getMonth()+1, year = dateobj.getFullYear();    var formattddate = (date<10?"0":"")+date+"/"+(month<10?"0":"")+month+"/"+year;    return formattddate;}
function getWeeksInaMonth(){    var startdate = new Date(date.getFullYear(), date.getMonth(), 1);     var enddate = new Date(date.getFullYear(), date.getMonth()+1, 0);    var weeks = [];    for(var i=1,n=enddate.getDate();i<n;)    {        startdate.setDate(i);        var arr = [getFormattedDate(startdate)];        i =i+ 6-startdate.getDay();        if(i>n) i=i-(i-n);        startdate.setDate(i);        arr.push(getFormattedDate(startdate));        i++;        weeks.push(arr);    }    return weeks}
function getCurrentWeek(){    var today = new Date(), day = today.getDay();    return [getFormattedDate(new Date(today.getFullYear(),today.getMonth(),today.getDate()-day)),            getFormattedDate(new Date(today.getFullYear(),today.getMonth(),today.getDate()+6-day))];}
function getCurrAndPrevWeeks(){    var startdate = new Date(date.getFullYear(), date.getMonth(), 1);     var enddate = new Date(date.getFullYear(), date.getMonth()+1, 0);    var today = new Date().getDate();    var weeks = [];    for(var i=1,n=enddate.getDate();i<n;)    {        startdate.setDate(i);        var arr = [getFormattedDate(startdate)];        i =i+ 6-startdate.getDay();        if(i>n) i=i-(i-n);        startdate.setDate(i);        arr.push(getFormattedDate(startdate));        weeks.push(arr);        if(today>=i-6 && today<=i) break;        i++;    }    return weeks;}

Get Weeks in Month Through JavaScript

Get Weeks In Month Through Javascript

Getting current week of current month

how to get weeks in particular month with dates in java script

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