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