Dates.jl - week last week of year/first week of year

[bertschi]

Would that work for you?

julia> function dateinfo(d::Date)
           tmp = d - Day(dayofweek(d)-1)
           week(tmp), year(tmp)
       end
dateinfo (generic function with 1 method)

julia> Date(2020, 12, 31) |> dateinfo
(53, 2020)

julia> Date(2021, 01, 01) |> dateinfo
(53, 2020)