test_that("Conversion of sub-dates prior Posix origin is correct", {
  con <- local_con()

  df <- data.frame(
    d = as.Date(c(-1.1, -0.1, 0, 0.1, 1.1), origin = "1970-01-01")
  )

  duckdb_register(con, "df", df)
  withr::defer(duckdb_unregister(con, "df"))

  res <- dbGetQuery(con, "FROM df")

  expect_identical(
    as.character(df$d),
    as.character(res$d)
  )
})