Day of Year
Gets or sets the day of the year.
Accepts numbers from 1 to 366.
If the range is exceeded, it will bubble up to the years.
This requires the
DayOfYear
plugin to work
dayjs.extend(dayOfYear)
dayjs('2010-01-01').dayOfYear() // 1
dayjs('2010-01-01').dayOfYear(365) // 2010-12-31