IsoWeeksInYear

IsoWeeksInYear adds .isoWeeksInYear() API to return a number to get the number of weeks in year, according to ISO weeks.

TIP

This requires the IsLeapYear plugin to work

javascript

var isoWeeksInYear = require('dayjs/plugin/isoWeeksInYear');
// import isoWeeksInYear from 'dayjs/plugin/isoWeeksInYear' // ES 2015

var isLeapYear = require('dayjs/plugin/isLeapYear'); // dependent on isLeapYear plugin
// import isLeapYear from 'dayjs/plugin/isLeapYear' // ES 2015

dayjs.extend(isoWeeksInYear);
dayjs.extend(isLeapYear);

dayjs('2004-01-01').isoWeeksInYear(); // 53
dayjs('2005-01-01').isoWeeksInYear(); // 52

IsoWeeksInYear ​

IsoWeeksInYear