![]() ![]() ![]() We can use JavaScript date methods or use moment.js to get the week of the year. Then we call format with the 'W' formatting tag to get the week of the year of now. The getDay () method returns the day of the week (0 to 6) of a date. We pass in the now date to moment to create a moment object. Calculate week number of current date //define a date object variable that will take the current system date todaydate new Date () //find the year of the current date var oneJan new Date (todaydate.getFullYear (), 0, 1) // calculating number of days in given year before a given date var numberOfDays Math. To use it, we write: const now = new Date(2021, 3, 1) const week = moment(now).format('W') console.log(week) It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions. To get the corresponding four-digit year, use date. To get the ISO week number (1-53) of a Date object, use date. To review, open the file in an editor that reveals hidden Unicode characters. Then we divide that by 7 to get the number of weeks difference.Īnd we round that number up to the nearest integer with Math.ceil.Ī simpler way to get the week number of the year from a given date is to use moment.js. Week numbers in JavaScript How to get the week number from a date The code below adds two new functions to the Date object. Get week number This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. ![]() Then we add the day of the week plus 1 to get the actual number of days difference. Then we compute the week of the year by subtracting the timestamps of now and onejan.Īnd then we divide that by 86400000 to get the number of days difference between the 2 dates. Then we create the onejan date with which is January 1 of the same year as now. We have the now date which we want to get the year of the week from. One way to get the week of the year of a given date is to use JavaScript date methods to compute the week of the year of a given date ourselves.įor instance, we can write: const now = new Date(2021, 3, 1) const onejan = new Date(now.getFullYear(), 0, 1) const week = Math.ceil((((now.getTime() - onejan.getTime()) / 86400000) + onejan.getDay() + 1) / 7) console.log(week) In this article, we’ll look at how to get the week of the year of a given date with JavaScript. This ought to work even when February doesn't start on Sunday.Sometimes, we want to get the week of the year given a date. ![]()
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