Function duckdb_to_date 

pub unsafe extern "C" fn duckdb_to_date(
    date: duckdb_date_struct,
) -> duckdb_date

Re-compose a duckdb_date from year, month and date (duckdb_date_struct).

@param date The year, month and date stored in a duckdb_date_struct. @return The duckdb_date element.