IsoWeeksInYear
IsoWeeksInYear 增加了 .isoWeeksInYear()
API 返回一个 number
来得到依据 ISO week 标准一年中有几周
这依赖
IsLeapYear
插件,才能正常运行
var isoWeeksInYear = require('dayjs/plugin/isoWeeksInYear')
var isLeapYear = require('dayjs/plugin/isLeapYear') // dependent on isLeapYear plugin
dayjs.extend(isoWeeksInYear)
dayjs.extend(isLeapYear)
dayjs('2004-01-01').isoWeeksInYear() // 53
dayjs('2005-01-01').isoWeeksInYear() // 52