How to get Current week from given array of objects date in javascript

Question

I am having array of objects with date key,i want to filter out the objects which has current week,how can i achieve this which returns me the current week of objects.i tried using filter but first i need to format date key i guess.

const notificationItems = [
    {
      id: 1,
      date: '2021-02-10T05:04:59.525589Z',


      name: 'Glenn',

    },
    {
      id: 2,
      date: '2021-02-10T05:04:59.525589Z',


      name: 'Root',

    },
    {
      id: 3,
      date: '2021-01-08T05:04:59.525589Z',


      name: 'Smith',

    },
    {
      id: 4,
      date: '2019-02-03T05:04:59.525589Z',


      name: 'Ryan',

    },
    {
      id: 5,
      date: '2019-01-03T05:04:59.525589Z',


      name: 'Bob',

    }
  ]

user_1806171 · Answer

 Date.prototype.getWeek = function() {
    var date = new Date(this.getTime());
    date.setHours(0, 0, 0, 0);

    // Thursday in current week decides the year.
    date.setDate(date.getDate() + 3 - (date.getDay() + 6) % 7);

    // January 4 is always in week 1.
    var week1 = new Date(date.getFullYear(), 0, 4);

    // Adjust to Thursday in week 1 and count number of weeks from date to week1.
    return 1 + Math.round(((date.getTime() - week1.getTime()) / 86400000 - 3 + (week1.getDay() + 6) % 7) / 7);
}

user_6655160 · Answer

You could:

first, get week of year by .week()
second, get year by .year()
finally, filter the date that has the same year and the same week in year with the current date

const notificationItems = [
  {
    id: 1,
    date: "2021-02-10T05:04:59.525589Z",
    name: "Glenn",
  },
  {
    id: 2,
    date: "2021-02-10T05:04:59.525589Z",
    name: "Root",
  },
  {
    id: 3,
    date: "2021-01-08T05:04:59.525589Z",
    name: "Smith",
  },
  {
    id: 4,
    date: "2019-02-03T05:04:59.525589Z",
    name: "Ryan",
  },
  {
    id: 5,
    date: "2019-01-03T05:04:59.525589Z",
    name: "Bob",
  },
];

const sameYear = (date1, date2) =>
  moment(date1).year() === moment(date2).year();

const sameWeek = (date1, date2) =>
  moment(date1).week() === moment(date2).week();

const sameWeekInSameYear = (date1, date2) =>
  sameYear(date1, date2) && sameWeek(date1, date2);

const res = notificationItems.filter(({ date }) =>
  sameWeekInSameYear(date, new Date())
);

console.log(res);

user_12466239 · Answer

You have to create function with return number of week based on day number of first january and then use filter

const notificationItems = [
    {
      id: 1,
      date: '2021-02-10T05:04:59.525589Z',
      name: 'Glenn',

    },
    {
      id: 2,
      date: '2021-02-10T05:04:59.525589Z',
      name: 'Root',

    },
    {
      id: 3,
      date: '2021-01-08T05:04:59.525589Z',
      name: 'Smith',

    },
    {
      id: 4,
      date: '2019-02-03T05:04:59.525589Z',
      name: 'Ryan',

    },
    {
      id: 5,
      date: '2019-01-03T05:04:59.525589Z',
      name: 'Bob',

    }
  ]
  
  const getWeek = date => {
    let now = new Date(date);
    let firstJanuary = new Date(now.getFullYear(), 0, 1);
    return Math.ceil( (((now.getTime() - firstJanuary.getTime()) / 86400000) + firstJanuary.getDay() + 1) / 7 );
  }
  
  
  const currentWeek = getWeek(new Date);


  const currentWeekNotificatoinItems = notificationItems.filter(item => 
      getWeek(new Date(item.date)) === currentWeek
  )
  
 console.log(currentWeekNotificatoinItems)

user_12950795 · Answer

Try Using

const notificationItems = [
    {
      id: 1,
      date: '2021-02-10T05:04:59.525589Z',
      name: 'Glenn'

    },
    {
      id: 2,
      date: '2021-02-10T05:04:59.525589Z',
      name: 'Root'

    },
    {
      id: 3,
      date: '2021-01-08T05:04:59.525589Z',
      name: 'Smith'

    },
    {
      id: 4,
      date: '2019-02-03T05:04:59.525589Z',
      name: 'Ryan'
    },
    {
      id: 5,
      date: '2019-01-03T05:04:59.525589Z',
      name: 'Bob'
    }
];

let curr = new Date; // get current date
let first = curr.getDate() - curr.getDay();
let last = first + 6; 

let firstday = new Date(curr.setDate(first));
let lastday = new Date(curr.setDate(last));

let a = notificationItems.filter((item) => {
   let date = new Date(item.date);
   if(date.getTime() >= firstday.getTime() && date.getTime() <= lastday.getTime()) {
      return item;
   }
});

console.log(a);

Hope this helps :)

user_9596951 · Answer

Maybe you can consider using of moment.js library https://github.com/moment/moment

notificationItems.filter(
  (notification) =>
    moment(notification.date).week() === moment().week() &&
    moment(notification.date).year() === moment().year()
);

then by this code you will get only the notifications on this week

How to get Current week from given array of objects date in javascript

5 Answers