A recent discussion <https://github.com/elixir-lang/elixir/pull/14162>
clarified
that the return value from `Date.day_of_week/2` is an ordinal value. That
is, when it returns "1" that means "first day of week". It specifically
does not mean "1" is Monday.
That means that it would be useful to have a function that does return the
cardinal day of week - that is, a number where 1 == Monday and 7 == Sunday.
The function would look something like:
def iso_day_of_week(%{calendar: Calendar.ISO} = date) do
day_of_week(date)
end
def iso_day_of_week(date) do
date
|> convert!(Calendar.ISO)
|> day_of_week()
end
This implementation relies on the knowledge that when called with
starting_on = :default (which is the default argument value) the returned
value is indeed 1 == Monday, 7 == Sunday.
If there is any consensus I'll submit a PR.
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