Function melib::email::parser::dates::day_of_week

fn day_of_week(input: &[u8]) -> IResult<&[u8], Cow<'_, [u8]>>

day-of-week = ([FWS] day-name) / obs-day-of-week day-name = "Mon" / "Tue" / "Wed" / "Thu" / "Fri" / "Sat" / "Sun"