I think you’re looking for Dates.value
:
help?> Dates.value
Dates.value(x::Period) → Int64For a given period, return the value associated with that period. For example, value(Millisecond(10)) returns 10 as an integer.
For example:
julia> using Dates
julia> d = Day(42)
42 days
julia> Dates.value(d)
42