How can i get the week number of month using javascript / jquery?
For ex.:
First Week: 5th July, 2010. / Week Number = First monday
Previous Week: 12th July, 2010. / Week Number = Second monday
Current Date: 19th July, 2010. / Week Number = Third Monday
Next week: 26th July, 2010. / Week Number = Last monday
This is an old question, here is my cross-browser solution based on:
So in March 2013:
Date.prototype.getWeekOfMonth = function(exact) {
var month = this.getMonth()
, year = this.getFullYear()
, firstWeekday = new Date(year, month, 1).getDay()
, lastDateOfMonth = new Date(year, month + 1, 0).getDate()
, offsetDate = this.getDate() + firstWeekday - 1
, index = 1 // start index at 0 or 1, your choice
, weeksInMonth = index + Math.ceil((lastDateOfMonth + firstWeekday - 7) / 7)
, week = index + Math.floor(offsetDate / 7)
;
if (exact || week < 2 + index) return week;
return week === weeksInMonth ? index + 5 : week;
};
// Simple helper to parse YYYY-MM-DD as local
function parseISOAsLocal(s){
var b = s.split(/\D/);
return new Date(b[0],b[1]-1,b[2]);
}
// Tests
console.log('Date Exact|expected not exact|expected');
[ ['2013-02-01', 1, 1],['2013-02-05', 2, 2],['2013-02-14', 3, 3],
['2013-02-23', 4, 4],['2013-02-24', 5, 6],['2013-02-28', 5, 6],
['2013-03-01', 1, 1],['2013-03-02', 1, 1],['2013-03-03', 2, 2],
['2013-03-15', 3, 3],['2013-03-17', 4, 4],['2013-03-23', 4, 4],
['2013-03-24', 5, 5],['2013-03-30', 5, 5],['2013-03-31', 6, 6],
['2013-04-01', 1, 1]
].forEach(function(test){
var d = parseISOAsLocal(test[0])
console.log(test[0] + ' ' +
d.getWeekOfMonth(true) + '|' + test[1] + ' ' +
d.getWeekOfMonth() + '|' + test[2]);
});You don't need to put it directly on the prototype if you don't want to. In my implementation, 6 means "Last", not "Sixth". If you want it to always return the actual week of the month, just pass true.
EDIT: Fixed this to handle 5 & 6-week months. My "unit tests", feel free to fork: http://jsfiddle.net/OlsonDev/5mXF6/1/.
function getWeekOfMonth(date) {
const startWeekDayIndex = 1; // 1 MonthDay 0 Sundays
const firstDate = new Date(date.getFullYear(), date.getMonth(), 1);
const firstDay = firstDate.getDay();
let weekNumber = Math.ceil((date.getDate() + firstDay) / 7);
if (startWeekDayIndex === 1) {
if (date.getDay() === 0 && date.getDate() > 1) {
weekNumber -= 1;
}
if (firstDate.getDate() === 1 && firstDay === 0 && date.getDate() > 1) {
weekNumber += 1;
}
}
return weekNumber;
}
I hope this works Tested until 2025
import getWeekOfMonth from 'date-fns/getWeekOfMonth'
...
let weekOfMonth = getWeekOfMonth(new Date())
None of the previous solutions included the "Last" on the response and I was able to do it by checking the next occurrence of the same day of the week and checking if it's still on this month.
The accepted answer fails in many cases (I tested it with today's date - 2021-05-14 - and it returned "Third Friday" when it's actually the second).
This code below was tested even with April 2017 (a rare case of a month with 6 weeks).
/**
* Get the week number of the month, from "First" to "Last"
* @param {Date} date
* @returns {string}
*/
function weekOfTheMonth(date) {
const day = date.getDate()
const weekDay = date.getDay()
let week = Math.ceil(day / 7)
const ordinal = ['First', 'Second', 'Third', 'Fourth', 'Last']
const weekDays = ['Sunday','Monday','Tuesday','Wednesday', 'Thursday','Friday','Saturday']
// Check the next day of the week and if it' on the same month, if not, respond with "Last"
const nextWeekDay = new Date(date.getTime() + (1000 * 60 * 60 * 24 * 7))
if (nextWeekDay.getMonth() !== date.getMonth()) {
week = 5
}
return `${ordinal[week - 1]} ${weekDays[weekDay]}`
}
const days = [
new Date('2021-05-14'),
new Date('26 July 2010'),
new Date('5 July 2010'),
new Date('12 July 2010'),
new Date('22 April 2017'),
new Date('29 April 2017'),
]
for (let i = 0; i < days.length; i += 1) {
const d = days[i]
console.log(d, weekOfTheMonth(d))
}Please try below function.This one is considering week start date as Monday and week end date as Sunday.
getWeekNumber(date) {
var monthStartDate =new Date(new Date().getFullYear(), new
Date().getMonth(), 1);
monthStartDate = new Date(monthStartDate);
var day = startdate.getDay();
date = new Date(date);
var date = date.getDate();
return Math.ceil((date+ day-1)/ 7);
}