How compare array of dates with an date string to find count of same days in JavaScript?

Question

I tried this method to check duplicate date in the array with date string array, but didn't work Please anyone can help..

    const dateArray = ["2000-07-13","03/24/2000", "June 7 2021"]
    const compaingDate =new Date("2000-06-13")
    let countOfDays=0
    for(let sameDate of dateArray){
        if(compaingDate.getDate()===sameDate.getDate()){
            countOfDays+=1
        }
    }
    console.log(countOfDays);

Do you want to compare just the day of the month or the whole date? [MDN getDate](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/getDate) — Louys Patrice Bessette, Feb 11 '22 at 16:07
Re `new Date("2000-06-13")`, see [*Why does Date.parse give incorrect results?*](https://stackoverflow.com/questions/2587345/why-does-date-parse-give-incorrect-results) — RobG, Feb 11 '22 at 20:24

score 0 · Answer 1 · answered Feb 11 '22 at 16:01

0

You never convert the array of strings into an array of dates:

    const dateArray = ["2000-07-13","03/24/2000", "June 7 2021", "June 13 2006"]
    const compaingDate =new Date("2000-06-13")
    let countOfDays=0
    for(let sameDate of dateArray){
    sameDate = new Date(sameDate)
        if(compaingDate.getDate()===sameDate.getDate()){
            countOfDays+=1
        }
    }
    console.log(countOfDays);

answered Feb 11 '22 at 16:01

Coder Gautam YT

1,044
7
20

Parsing arbitrary timestamps with the built–in parser is not a good idea, see [*Why does Date.parse give incorrect results?*](https://stackoverflow.com/questions/2587345/why-does-date-parse-give-incorrect-results) – RobG Feb 11 '22 at 20:25

score 0 · Answer 2 · answered Feb 11 '22 at 16:22

Maybe this is what you are looking for?

A shorten version:

const dateArray = ["2000-07-13", "03/24/2000", "June 7 2021"]
const compaingDate = new Date("2000-06-13")
let countOfDays = 0
dateArray.forEach(item => {
  if (new Date(item).getDate() === compaingDate.getDate())
    countOfDays++
})
console.log(countOfDays);

How compare array of dates with an date string to find count of same days in JavaScript?

2 Answers2