DateTime object, created
from a string in ISO ordinal date format.
The time component will be set to 00:00:00.000000.
yyyyddd and the extended
format yyyy-ddd are accepted, where
ddd is the ordinal number of a day within year
yyyy.
The allowed range for ddd is 1 through the number of
days in year yyyy, which is either 365 or 366.
Leading zeros are required for both yyyy and
ddd.
say .DateTime~fromOrdinalDate("2020-041") -- 2020-02-10T00:00:00.000000