CODEWITHSUNDEEP
javascriptmomentjs
ololo
ololo

Reputation: 2036

Get the 2nd Friday of a month with MomentJS

I am trying to get the nth Friday of a month with momentjs

where n is in the range [1,4]

So if a user supplies n as 2. Then I need to get the date for the second Friday of the month.

Here is what I tried with no sucess

let startingFrom = new Date("StartDateStringGoesHere");
let n=2;
let nthFriday = moment(startDate).isoWeekday(n); //I can't figure out how to resolve it here

Any ideas will be truly appreciated.

Upvotes: 1

Views: 756

Answers (2)

Bravo
Bravo

Reputation: 6264

Here's a generic function, no library needed

Edit: added logic to get last occurence (simply use 5)

function nthWeekdayOfMonth(year, month, nth, dow) {
    const d = new Date(year, month - 1, 7 * (nth - 1) + 1);
    const w = d.getDay();
    d.setDate(d.getDate() + (7 + dow - w) % 7);
    // 5th occurance means last, so here is logic for last dow of month
    if (d.getMonth() + 1 > month || d.getFullYear() > year) {
      d.setDate(d.getDate() - 7);
    }
    return d;
}

// second(2) friday(5)
for (let month = 1; month < 13; month++) {
    console.log(nthWeekdayOfMonth(2022, month, 2, 5).toString());
}

// third(3) sunday(0)
for (let month = 1; month < 13; month++) {
    console.log(nthWeekdayOfMonth(2022, month, 3, 0).toString());
}
// last(5) Sunday(0)
for (let month = 1; month < 13; month++) {
    console.log(nthWeekdayOfMonth(2022, month, 5, 6).toString());
}

Upvotes: 2

Aidan Donnelly
Aidan Donnelly

Reputation: 389

Here is an example function to do this in m

// Using moment get all Fridays in a month
const searchDate = moment()

function getNthDay(n, day, startDate){
    let daysArray = []
    for (let i = 0; i <= startDate.daysInMonth(); i++) {
        const currentDay = moment().startOf("month").add(i, "days");
        if (currentDay.format('dddd') === day) {
            daysArray.push(currentDay);
        }
    }
    
    return daysArray[n];
}

const nDay = getNthDay(1, 'Friday', searchDate);

console.log(nDay)

Upvotes: 0

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