// local-date-arithmetic.el — LocalDate + Duration produces a LocalDate.
// 2026-05-28 + 7 days crosses the May/June boundary, yielding 2026-06-04.

fn run_test() -> String {
    let d1: LocalDate = local_date(2026, 5, 28)
    let week: Duration = 7.days
    let d2: LocalDate = d1 + week
    let y: Int = local_date_year(d2)
    let m: Int = local_date_month(d2)
    let day: Int = local_date_day(d2)
    return int_to_str(y) + "-" + int_to_str(m) + "-" + int_to_str(day)
}

fn main() -> Void {
    println(run_test())
}