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JavaScript: How to get simple date without timezone

I have code that generates random dates in a date range, which gives me dates which, when logged, produce this format:
Wed Sep 25 2019 05:00:00 GMT+0500 (Pakistan Standard Time)
I just want to get the date without timezone and Day specifically like this:
2019-09-25
I am trying to get random dates between specified dates using the following code:
var startDate = new Date("2019-08-26"); //YYYY-MM-DD
var endDate = new Date("2019-09-25"); //YYYY-MM-DD
var getDateArray = function(start, end) {
var arr = new Array();
var dt = new Date(start);
while (dt <= end) {
arr.push(new Date(dt));
dt.setDate(dt.getDate() + 1);
}
return arr;
}
var dateArr = getDateArray(startDate, endDate);
function shuffle(arra1) {
var ctr = arra1.length, temp, index;
// While there are elements in the array
while (ctr > 0) {
// Pick a random index
index = Math.floor(Math.random() * ctr);
// Decrease ctr by 1
ctr--;
// And swap the last element with it
temp = arra1[ctr];
arra1[ctr] = arra1[index];
arra1[index] = temp;
}
return arra1; }
console.log(shuffle(dateArr));
It's not a duplicate question as I was trying to achieve different and very specific formate.

One solution would be to map each item of arra1 through a custom formating function (ie formatDate()) where .getDate(), .getMonth() and .getYear() are used to populate the formatted string:
function formatDate(date) {
const year = date.getFullYear();
/* getMonth returns dates from 0, so add one */
const month = date.getMonth() + 1;
const day = date.getDate();
return `${year}-${month < 10 ? '0' : ''}${ month }-${ day < 10 ? '0' : '' }${day}`
}
Some points to consider here are:
Date#getMonth() returns 0-indexed dates in the range of 0-11. To match the desired date format, you should add 1 as shown
Check for day and month values that are less than 10 and prefix a 0 to pad those numbers to obtain the desired formatting
This can be added to your existing code as shown:
var startDate = new Date("2019-08-26"); //YYYY-MM-DD
var endDate = new Date("2019-09-25"); //YYYY-MM-DD
function formatDate(date) {
const year = date.getFullYear();
/* getMonth returns dates from 0, so add one */
const month = date.getMonth() + 1;
const day = date.getDate();
return `${year}-${month < 10 ? '0' : ''}${ month }-${ day < 10 ? '0' : '' }${day}`
}
var getDateArray = function(start, end) {
var arr = new Array();
var dt = new Date(start);
while (dt <= end) {
arr.push(new Date(dt));
dt.setDate(dt.getDate() + 1);
}
return arr;
}
var dateArr = getDateArray(startDate, endDate);
function shuffle(arra1) {
var ctr = arra1.length,
temp, index;
// While there are elements in the array
while (ctr > 0) {
// Pick a random index
index = Math.floor(Math.random() * ctr);
// Decrease ctr by 1
ctr--;
// And swap the last element with it
temp = arra1[ctr];
arra1[ctr] = arra1[index];
arra1[index] = temp;
}
/* Update this line */
return arra1.map(formatDate);
}
console.log(shuffle(dateArr));

Use .toISOString() and .substr(). Example:
var dt = new Date("2019-09-25");
console.log(dt.toISOString().substr(0,10)); // 2019-09-25
The advantage of this approach is that the Date object has the .toISOString() method built-in, so you don't have to reinvent the wheel. That method returns a full ISO string, though, like "2019-09-25T00:00:00.000Z". So, you can use .substr to retrieve only the part you want to use.

var getDates = function(startDate, endDate) {
var dates = [],
currentDate = startDate,
addDays = function(days) {
var date = new Date(this.valueOf());
date.setDate(date.getDate() + days);
return date;
};
while (currentDate <= endDate) {
dates.push(currentDate);
currentDate = addDays.call(currentDate, 1);
}
return dates;
};
// Usage
var dates = getDates(new Date(2019, 10, 22),
new Date(2019, 11, 25));
dates.forEach(function(date) {
console.log(date);
});

Get end date from a given start date , weekdays and number of occuring of executions

I am new to programming. I am using javascript right now. I wanted codes to get end date for a execution. I have got Startdate, weekdays(days in which execution occures) and number of executions to occure. How can i get end date???
For example Start date is '15 - 03 - 2018'
days to be executed are Sunday ie '0' and friday '5'
Number of executions from start date to end date is 5
End date of execution here should be '30-03-2018' which is to be retrieved.
Any idea...

Hope this helps.
var date = new Date(2018,2,15); // set date to 15-Mar-2018
var weekdays = [0,6]; // set weekdays
var noOfExcution = 3;
var day = 7 - date.getDay(); //calculate first week days
noOfExcution -= weekdays.filter(x=>x>=date.getDay()).length;
day += noOfExcution % weekdays.length > 0
? weekdays[noOfExcution % weekdays.length - 1]
: weekdays[weekdays.length-1]; //calulate last week days
var x = Math.floor((noOfExcution-0.1) / weekdays.length) * 7 +
day; //calculate in between dates
date.setDate(date.getDate() + x); //setting end date
console.log(date.toLocaleString()); //printing end date

It can be done like this. I somehow figured out a method.
function calcDate() {
var type="weekly";
var date1=new Date('2018,mar,18');
var date2;
var gdays=[];
gdays[0]=0;
gdays[1]=1;
count=10;
if(type=="weekly"){
var d1=date1.getDate();
var year=date1.getFullYear();
var month=date1.getMonth();
while(count>0){
var temp=[];
var tempdays=[];
tempdays=getDaysInMonth(month,year,d1);
console.log(tempdays);
for(var i=0;i<=gdays.length-1;i++) {
var on=gdays[i];
var ddd=days(year,month,on);
for(var j=0;j<=ddd.length-1;j++){
temp.push(ddd[j]);
}
}
temp.sort(function(a, b){return a-b});
console.log(temp);
for(var k=0;k<=temp.length-1;k++){
if(tempdays.includes(temp[k])){
var finalday=temp[k];
count--;
alert("count" +count);
if(count==0) break;
}
}
if(count==0){
alert("final day"+finalday);
date2=new Date(year,month,finalday);
alert(date2);
}
if(count>0){
d1=0;
month=month+1;
if(month>11){
month=0;
year=year+1;
}
}
}
}
function days(year,month,on){
var day, counter, date;
var days=[];
day = 1;
counter = 0;
date = new Date(year, month, day);
while (date.getMonth() === month) {
if (date.getDay() ==on) { // Sun=0, Mon=1, Tue=2, etc.
days[counter]=date.getDate();
counter += 1;
}
day += 1;
date = new Date(year, month, day);
}
return(days);
}
function getDaysInMonth(month, year,day) {
day++;
alert(day);
var date = new Date(year, month, day);
var days = [];
while (date.getMonth() === month) {
var i=date.getDate();
days.push(i);
date.setDate(date.getDate()+1);
}
return days;
}
}

How to calculate time period between two dates - angularjs

I want to calculate exact month and days between two dates.
If my start-date is "Jan 12, 2014" and my end-date is "Mar 27, 2017".
I should get as "38 months and 15 days".
But I am able to find only no. of days between start-date and end-date. I need some help to find months and days between start-date and end-date.
Then I need to divide the 15 days by no. of days of the end-date month.
Can anyone help me? I am new to date function.
var date = new Date();
console.log("date: "+date);
var currentDate = $filter('date')(date, "yyyy-MM-dd HH:mm:ss");
$scope.userdob = "2017-01-29";
var dobdate = $filter('date')($scope.userdob, "yyyy-MM-dd HH:mm:ss");
console.log("dob: "+dobdate);
/* differentiate Date */
var date1 = $filter('date')($scope.userdob, "yyyy-MM-dd");
var date2 = $filter('date')(date, "yyyy-MM-dd");
date1 = date1.split('-');
date2 = date2.split('-');
// Now we convert the array to a Date object, which has several helpful methods
date1 = new Date(date1[0], date1[1], date1[2]);
date2 = new Date(date2[0], date2[1], date2[2]);
// We use the getTime() method and get the unixtime (in milliseconds, but we want seconds, therefore we divide it through 1000)
var date1_unixtime = parseInt(date1.getTime() / 1000);
var date2_unixtime = parseInt(date2.getTime() / 1000);
// This is the calculated difference in seconds
var timeDifference = date2_unixtime - date1_unixtime;
// in Hours
var timeDifferenceInHours = timeDifference / 60 / 60;
// and finaly, in days :)
$scope.timeDifferenceInDays = timeDifferenceInHours / 24;
console.log("timeDifferenceInDays: "+$scope.timeDifferenceInDays);

Try this:
function monthCalculator() {
var d1 = new Date();
var d2 = new Date('2013', '02', 12);
var years = d1.getFullYear() - d2.getFullYear();
var months = d1.getMonth() - d2.getMonth();
var totalMonths = (years * 12) + months;
var d1Date = d1.getDate();
var d2Date = d2.getDate();
var days = d1Date - d2Date;
var d1LastDate = null;
var d2LastDate = null;
if(days < 0) {
var d1LastDate = new Date(d1.getFullYear(), d1.getMonth() + 1, 0).getDate();
var d2LastDate = new Date(d2.getFullYear(), d2.getMonth() + 1, 0).getDate();
if(d1Date != d1LastDate || d2Date != d2LastDate) {
totalMonths -= 1;
days = (new Date(d2.getFullYear(), d2.getMonth() + 1, 0).getDate()) + days;
} else {
days = 0;
}
}
console.log(totalMonths);
return totalMonths;
}

Maybe I'm interpreting it wrong but shouldn't it just be
var diffMonths = date2.getMonth() - date1.getMonth();
var diffDays = date2.getDate() - date1.getDate();
var diffYears = date2.getYear() - date1.getYear();
diffMonths += 12* diffYears
if(diffDays<0){
diffMonths -= 1;
var daysInMonth = new Date(date2.getYear(), date2.getMonth()-1, 0).getDate();
diffDays = daysInMonth + diffDays;
}
console.log('The difference between the two dates is ' + diffMonths + ' months and ' + diffDays + ' days');
Greetings Chris

How to count the number of sundays between two dates

I tried the JS below:
var start = new Date("25-05-2016");
var finish = new Date("31-05-2016");
var dayMilliseconds = 1000 * 60 * 60 * 24;
var weekendDays = 0;
while (start <= finish) {
var day = start.getDay()
if (day == 0) {
weekendDays++;
}
start = new Date(+start + dayMilliseconds);
}
alert(weekendDays);
However, it gives the wrong output.
I need to get the total count of Sundays between the two dates.

You use incorrect date format.It will work if init date so:
var start = new Date("2016-05-25");
var finish = new Date("2016-05-31");

Your date format is wrong. Dates' string format is "yyyy-mm-dd". See here for more information.
Also, looping each day of the interval is very inefficient. You may try the following instead.
function getNumberOfWeekDays(start, end, dayNum){
// Sunday's num is 0 with Date.prototype.getDay.
dayNum = dayNum || 0;
// Calculate the number of days between start and end.
var daysInInterval = Math.ceil((end.getTime() - start.getTime()) / (1000 * 3600 * 24));
// Calculate the nb of days before the next target day (e.g. next Sunday after start).
var toNextTargetDay = (7 + dayNum - start.getDay()) % 7;
// Calculate the number of days from the first target day to the end.
var daysFromFirstTargetDay = Math.max(daysInInterval - toNextTargetDay, 0);
// Calculate the number of weeks (even partial) from the first target day to the end.
return Math.ceil(daysFromFirstTargetDay / 7);
}
var start = new Date("2016-05-25");
var finish = new Date("2016-05-31");
console.log("Start:", start);
console.log("Start's week day num:", start.getDay());
console.log("Finish:", finish);
console.log("Finish's week day num:", finish.getDay());
console.log("Number of Sundays:", getNumberOfWeekDays(start, finish));

Your date format and comparison condition should change like the following:
var start = new Date("2016-05-11");
var finish = new Date("2016-05-31");
var dayMilliseconds = 1000 * 60 * 60 * 24;
var weekendDays = 0;
while (start.getTime() <= finish.getTime()) {
var day = start.getDay();
if (day == 0) {
weekendDays++;
}
start = new Date(+start + dayMilliseconds);
}
alert(weekendDays);
Check Fiddle

You are using incorrect date format.
Just Change the format to:
var start = new Date(2016, 4, 25);
var finish = new Date(2016, 4, 31);

Try this function:
function CalculateWeekendDays(fromDate, toDate){
var weekendDayCount = 0;
while(fromDate < toDate){
fromDate.setDate(fromDate.getDate() + 1);
if(fromDate.getDay() === 0){
++weekendDayCount ;
}
}
return weekendDayCount ;
}
console.log(CalculateWeekendDays(new Date(2011, 6, 2), new Date(2011, 7, 2)));
This will give you number of sunday come between 2 dates

change your date format.It will work
var start = new Date("05-16-2016");
var finish = new Date("05-31-2016");
var dayMilliseconds = 1000 * 60 * 60 * 24;
var weekendDays = 0;
while (start <= finish) {
var day = start.getDay()
if (day == 0) {
weekendDays++;
}
start = new Date(+start + dayMilliseconds);
}
console.log(weekendDays);

JS date format doesn't have "dd-MM-yyyy" ,so it will invalid date format .Try recreate date is ok or just change your date format Date Format
Try this:
var start = new Date("25-05-2016");
var end = new Date("31-05-2016");
var startDate = new Date(start);
var endDate = new Date(end);
var totalSundays = 0;
for (var i = startDate; i <= endDate; ){
if (i.getDay() == 0){
totalSundays++;
}
i.setTime(i.getTime() + 1000*60*60*24);
}
console.log(totalSundays);

// Find date of sundays b/w two dates
var fromDate = new Date('2022-10-26')
var toDate = new Date('2022-11-31')
var sunday = 0
var milisec = 1000 * 60 * 60 * 24;
while (fromDate <= toDate) {
var day = fromDate.getDay()
if (day == 0) {
sunday++
console.log('Date of sunday:', fromDate)
}
fromDate = new Date(+fromDate + milisec)
}
console.log('Total no. of sundays:', sunday)

Get Weeks In Month Through Javascript

In Javascript, how do I get the number of weeks in a month? I can't seem to find code for this anywhere.
I need this to be able to know how many rows I need for a given month.
To be more specific, I would like the number of weeks that have at least one day in the week (a week being defined as starting on Sunday and ending on Saturday).
So, for something like this, I would want to know it has 5 weeks:
S M T W R F S
1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31
Thanks for all the help.

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);
}

None of the solutions proposed here don't works correctly, so I wrote my own variant and it works for any cases.
Simple and working solution:
/**
* Returns count of weeks for year and month
*
* #param {Number} year - full year (2016)
* #param {Number} month_number - month_number is in the range 1..12
* #returns {number}
*/
var weeksCount = function(year, month_number) {
var firstOfMonth = new Date(year, month_number - 1, 1);
var day = firstOfMonth.getDay() || 6;
day = day === 1 ? 0 : day;
if (day) { day-- }
var diff = 7 - day;
var lastOfMonth = new Date(year, month_number, 0);
var lastDate = lastOfMonth.getDate();
if (lastOfMonth.getDay() === 1) {
diff--;
}
var result = Math.ceil((lastDate - diff) / 7);
return result + 1;
};
you can try it here

This is very simple two line code. and i have tested 100%.
Date.prototype.getWeekOfMonth = function () {
var firstDay = new Date(this.setDate(1)).getDay();
var totalDays = new Date(this.getFullYear(), this.getMonth() + 1, 0).getDate();
return Math.ceil((firstDay + totalDays) / 7);
}
How to use
var totalWeeks = new Date().getWeekOfMonth();
console.log('Total Weeks in the Month are : + totalWeeks );

You'll have to calculate it.
You can do something like
var firstDay = new Date(2010, 0, 1).getDay(); // get the weekday january starts on
var numWeeks = 5 + (firstDay >= 5 ? 1 : 0); // if the months starts on friday, then it will end on sunday
Now we just need to genericize it.
var dayThreshold = [ 5, 1, 5, 6, 5, 6, 5, 5, 6, 5, 6, 5 ];
function GetNumWeeks(month, year)
{
var firstDay = new Date(year, month, 1).getDay();
var baseWeeks = (month == 1 ? 4 : 5); // only February can fit in 4 weeks
// TODO: account for leap years
return baseWeeks + (firstDay >= dayThreshold[month] ? 1 : 0); // add an extra week if the month starts beyond the threshold day.
}
Note: When calling, remember that months are zero indexed in javascript (i.e. January == 0).

function weeksinMonth(m, y){
y= y || new Date().getFullYear();
var d= new Date(y, m, 0);
return Math.floor((d.getDate()- 1)/7)+ 1;
}
alert(weeksinMonth(3))
// the month range for this method is 1 (january)-12(december)

The most easy to understand way is
<div id="demo"></div>
<script type="text/javascript">
function numberOfDays(year, month)
{
var d = new Date(year, month, 0);
return d.getDate();
}
function getMonthWeeks(year, month_number)
{
var $num_of_days = numberOfDays(year, month_number)
, $num_of_weeks = 0
, $start_day_of_week = 0;
for(i=1; i<=$num_of_days; i++)
{
var $day_of_week = new Date(year, month_number, i).getDay();
if($day_of_week==$start_day_of_week)
{
$num_of_weeks++;
}
}
return $num_of_weeks;
}
var d = new Date()
, m = d.getMonth()
, y = d.getFullYear();
document.getElementById('demo').innerHTML = getMonthWeeks(y, m);
</script>

using moment js
function getWeeksInMonth(year, month){
var monthStart = moment().year(year).month(month).date(1);
var monthEnd = moment().year(year).month(month).endOf('month');
var numDaysInMonth = moment().year(year).month(month).endOf('month').date();
//calculate weeks in given month
var weeks = Math.ceil((numDaysInMonth + monthStart.day()) / 7);
var weekRange = [];
var weekStart = moment().year(year).month(month).date(1);
var i=0;
while(i<weeks){
var weekEnd = moment(weekStart);
if(weekEnd.endOf('week').date() <= numDaysInMonth && weekEnd.month() == month) {
weekEnd = weekEnd.endOf('week').format('LL');
}else{
weekEnd = moment(monthEnd);
weekEnd = weekEnd.format('LL')
}
weekRange.push({
'weekStart': weekStart.format('LL'),
'weekEnd': weekEnd
});
weekStart = weekStart.weekday(7);
i++;
}
return weekRange;
} console.log(getWeeksInMonth(2016, 7))

ES6 variant, using consistent zero-based months index. Tested for years from 2015 to 2025.
/**
* Returns number of weeks
*
* #param {Number} year - full year (2018)
* #param {Number} month - zero-based month index (0-11)
* #param {Boolean} fromMonday - false if weeks start from Sunday, true - from Monday.
* #returns {number}
*/
const weeksInMonth = (year, month, fromMonday = false) => {
const first = new Date(year, month, 1);
const last = new Date(year, month + 1, 0);
let dayOfWeek = first.getDay();
if (fromMonday && dayOfWeek === 0) dayOfWeek = 7;
let days = dayOfWeek + last.getDate();
if (fromMonday) days -= 1;
return Math.ceil(days / 7);
}

You could use my time.js library. Here's the weeksInMonth function:
// http://github.com/augustl/time.js/blob/623e44e7a64fdaa3c908debdefaac1618a1ccde4/time.js#L67
weeksInMonth: function(){
var millisecondsInThisMonth = this.clone().endOfMonth().epoch() - this.clone().firstDayInCalendarMonth().epoch();
return Math.ceil(millisecondsInThisMonth / MILLISECONDS_IN_WEEK);
},
It might be a bit obscure since the meat of the functionality is in endOfMonth and firstDayInCalendarMonth, but you should at least be able to get some idea of how it works.

This works for me,
function(d){
var firstDay = new Date(this.getFullYear(), this.getMonth(), 1).getDay();
return Math.ceil((d.getDate() + (firstDay - 1))/7);
}
"d" should be the date.

A little rudimentary, yet should cater for original post :
/**
* #param {date} 2020-01-30
* #return {int} count
*/
this.numberOfCalendarWeekLines = date => {
// get total
let lastDayOfMonth = new Date( new Date( date ).getFullYear(), new Date( date ).getMonth() + 1, 0 );
let manyDaysInMonth = lastDayOfMonth.getDate();
// itterate through month - from 1st
// count calender week lines by occurance
// of a Saturday ( s m t w t f s )
let countCalendarWeekLines = 0;
for ( let i = 1; i <= manyDaysInMonth; i++ ) {
if ( new Date( new Date( date ).setDate( i ) ).getDay() === 6 ) countCalendarWeekLines++;
}
// days after last occurance of Saturday
// leaked onto new line?
if ( lastDayOfMonth.getDay() < 6 ) countCalendarWeekLines++;
return countCalendarWeekLines;
};

Thanks to Ed Poor for his solution, this is the same as Date prototype.
Date.prototype.countWeeksOfMonth = function() {
var year = this.getFullYear();
var month_number = this.getMonth();
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);
}
So you can use it like
var weeksInCurrentMonth = new Date().countWeeksOfMonth();
var weeksInDecember2012 = new Date(2012,12,1).countWeeksOfMonth(); // 6

function getWeeksInMonth(month_number, year) {
console.log("year - "+year+" month - "+month_number+1);
var day = 0;
var firstOfMonth = new Date(year, month_number, 1);
var lastOfMonth = new Date(year, parseInt(month_number)+1, 0);
if (firstOfMonth.getDay() == 0) {
day = 2;
firstOfMonth = firstOfMonth.setDate(day);
firstOfMonth = new Date(firstOfMonth);
} else if (firstOfMonth.getDay() != 1) {
day = 9-(firstOfMonth.getDay());
firstOfMonth = firstOfMonth.setDate(day);
firstOfMonth = new Date(firstOfMonth);
}
var days = (lastOfMonth.getDate() - firstOfMonth.getDate())+1
return Math.ceil( days / 7);
}
It worked for me. Please try
Thanks all

This piece of code give you the exact number of weeks in a given month:
Date.prototype.getMonthWeek = function(monthAdjustement)
{
var firstDay = new Date(this.getFullYear(), this.getMonth(), 1).getDay();
var returnMessage = (Math.ceil(this.getDate()/7) + Math.floor(((7-firstDay)/7)));
return returnMessage;
}
The monthAdjustement variable adds or substract the month that you are currently in
I use it in a calendar project in JS and the equivalent in Objective-C and it works well

function weekCount(year, month_number, day_start) {
// month_number is in the range 1..12
// day_start is in the range 0..6 (where Sun=0, Mon=1, ... Sat=6)
var firstOfMonth = new Date(year, month_number-1, 1);
var lastOfMonth = new Date(year, month_number, 0);
var dayOffset = (firstOfMonth.getDay() - day_start + 7) % 7;
var used = dayOffset + lastOfMonth.getDate();
return Math.ceil( used / 7);
}

I know this is coming late, I have seen codes upon codes trying to get the number of weeks a particular month falls on, but many have not been really precise but most have been really informative and reusable, I'm not an expert programmer but I can really think and thanks to some codes by some people I was able to arrive at a conclusion.
function convertDate(date) {//i lost the guy who owns this code lol
var yyyy = date.getFullYear().toString();
var mm = (date.getMonth()+1).toString();
var dd = date.getDate().toString();
var mmChars = mm.split('');
var ddChars = dd.split('');
return yyyy + '-' + (mmChars[1]?mm:"0"+mmChars[0]) + '-' + (ddChars[1]?dd:"0"+ddChars[0]);
}
//this line of code from https://stackoverflow.com/a/4028614/2540911
var days = ['Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
var myDate = new Date('2019-03-2');
//var myDate = new Date(); //or todays date
var c = convertDate(myDate).split("-");
let yr = c[0], mth = c[1], dy = c[2];
weekCount(yr, mth, dy)
//Ahh yes, this line of code is from Natim Up there, incredible work, https://stackoverflow.com/a/2485172/2540911
function weekCount(year, month_number, startDayOfWeek) {
// month_number is in the range 1..12
console.log(weekNumber);
// 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 first = firstOfMonth.getDate();
//initialize first week
let weekNumber = 1;
while(first-1 < numberOfDaysInMonth){
// add a day
firstOfMonth = firstOfMonth.setDate(firstOfMonth.getDate() + 1);//this line of code from https://stackoverflow.com/a/9989458/2540911
if(days[firstOfMonth.getDay()] === "Sunday"){//get new week every new sunday according the local date format
//get newWeek
weekNumber++;
}
if(weekNumber === 3 && days[firstOfMonth.getDay()] === "Friday")
alert(firstOfMonth);
first++
}
}
I needed this code to generate a schedule or event scheduler for a church on every 3rd friday of a new month, so you can modify this to suit your or just pick your specific date, not "friday and specify the week of the month and Voila!! here you go

None of the solutions here really worked for me. Here is my crack at it.
// Example
// weeksOfMonth(2019, 9) // October
// Result: 5
weeksOfMonth (year, monthIndex) {
const d = new Date(year, monthIndex+ 1, 0)
const adjustedDate = d.getDate() + d.getDay()
return Math.ceil(adjustedDate / 7)
}

Every solutions helped but nothing was working for me so I did my own with moment library :
const getWeeksInAMonth = (currentDate: string) => {
const startOfMonth = moment(currentDate).startOf("month")
const endOfMonth = moment(currentDate).endOf("month")
return moment(endOfMonth).week() - moment(startOfMonth).week() + 1
}