xpt write support for DateTime

[andreasnoack]

It would be great if writing dates worked

julia> writestat("dates.xpt", DataFrame(date=now()))
ERROR: element type DateTime is not supported
Stacktrace:
 [1] error(s::String)
   @ Base ./error.jl:35
 [2] rstype(type::Type)
   @ ReadStatTables ~/.julia/packages/ReadStatTables/f5Kes/src/writestat.jl:16
 [3] ReadStatTable(table::DataFrame, ext::String; refpoolaslabel::Bool, vallabels::Dict{Symbol, Dict}, hasmissing::Vector{Bool}, meta::ReadStatMeta, colmeta::StructArrays.StructVector{ReadStatColMeta, NamedTuple{(:label, :format, :type, :vallabel, :storage_width, :display_width, :measure, :alignment), Tuple{Vector{String}, Vector{String}, Vector{ReadStatTables.readstat_type_t}, Vector{Symbol}, Vector{UInt64}, Vector{Int32}, Vector{ReadStatTables.readstat_measure_t}, Vector{ReadStatTables.readstat_alignment_t}}}, Int64}, styles::Dict{Symbol, Symbol}, kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ ReadStatTables ~/.julia/packages/ReadStatTables/f5Kes/src/writestat.jl:0
 [4] ReadStatTable(table::DataFrame, ext::String)
   @ ReadStatTables ~/.julia/packages/ReadStatTables/f5Kes/src/writestat.jl:84
 [5] writestat(filepath::String, table::DataFrame; ext::String, kwargs::Base.Pairs{Symbol, Union{}, Tuple{}, NamedTuple{(), Tuple{}}})
   @ ReadStatTables ~/.julia/packages/ReadStatTables/f5Kes/src/writestat.jl:250
 [6] writestat(filepath::String, table::DataFrame)
   @ ReadStatTables ~/.julia/packages/ReadStatTables/f5Kes/src/writestat.jl:246
 [7] top-level scope
   @ REPL[9]:1

[junyuan-chen]

@andreasnoack Thanks for reporting.

This is a known limitation at this moment that hasn't been addressed due to temporary lack of manpower.

[junyuan-chen]

This should have been addressed by #36.