pub fn iso_week_from_days(z: i64) -> (i64, u32, u32)Expand description
The ISO-8601 week date of a day number: (iso_year, week, iso_weekday), with
week in 1..=53 and iso_weekday in 1..=7 (Monday … Sunday). The ISO year can differ
from the civil year near January 1 / December 31 (e.g. 2021-01-01 is ISO 2020-W53-5).