Cldr.Calendar.iso_week_of_year

You're seeing just the callback iso_week_of_year, go back to Cldr.Calendar module for more information.

iso_week_of_year(year, month, day)

Specs

iso_week_of_year(
  year :: Calendar.year(),
  month :: Calendar.month(),
  day :: Calendar.day()
) :: {Calendar.year(), Calendar.week()} | {:error, :not_defined}

Returns a tuple of {year, week_in_year} for a given year, month or week, and day for a a calendar.

The iso_week_of_year is calculated based on the ISO calendar.