Function erlang_nif_sys::erlang_nif_sys_api::enif_convert_time_unit

pub unsafe extern "C" fn enif_convert_time_unit(
    time: ErlNifTime, 
    from_unit: ErlNifTimeUnit, 
    to_unit: ErlNifTimeUnit
) -> ErlNifTime

See enif_convert_time_unit in the Erlang docs.