test_that("date.integer", {
  expect_identical(dtt_date(integer(0)), Sys.Date()[-1])
  expect_identical(dtt_date(NA_integer_), NA_Date_)
  expect_identical(as.integer(as.Date("1970-01-01")), 0L)
  expect_identical(dtt_date(0L), as.Date("1970-01-01"))
  expect_identical(dtt_date(c(2L, NA)), as.Date(c("1970-01-03", NA)))
  expect_identical(
    dtt_date(1:2),
    as.Date(c("1970-01-02", "1970-01-03"))
  )
})

test_that("date.double", {
  expect_identical(dtt_date(numeric(0)), Sys.Date()[-1])
  expect_identical(dtt_date(NA_real_), NA_Date_)
  expect_identical(dtt_date(1.999), dtt_date(1L))
  expect_identical(dtt_date(-1.999), dtt_date(-2L))
  expect_identical(dtt_date(c(2, NA)), as.Date(c("1970-01-03", NA)))
  expect_identical(
    dtt_date(c(1, 2)),
    as.Date(c("1970-01-02", "1970-01-03"))
  )
})

test_that("date.character", {
  expect_identical(dtt_date(character(0)), Sys.Date()[-1])
  expect_identical(dtt_date(NA_character_), NA_Date_)
  expect_identical(dtt_date("1970-01-04"), dtt_date(3L))
  expect_identical(dtt_date("1970-01-04.99999"), dtt_date(3L))
  expect_identical(dtt_date(c("1970-01-04", NA)), dtt_date(c(3L, NA)))
})

test_that("date.Date", {
  expect_identical(dtt_date(Sys.Date()[-1]), Sys.Date()[-1])
  expect_identical(dtt_date(NA_Date_), NA_Date_)
  expect_identical(dtt_date(as.Date("1970-01-04")), as.Date("1970-01-04"))
  expect_identical(
    dtt_date(as.Date("1970-01-04") + 0.999),
    as.Date("1970-01-04")
  )
  expect_identical(
    dtt_date(as.Date("1970-01-04") - 0.001),
    as.Date("1970-01-03")
  )
  expect_identical(
    dtt_date(c(as.Date("1970-01-04"), NA_Date_)),
    c(as.Date("1970-01-04"), NA_Date_)
  )
})

test_that("date.POSIXct", {
  expect_identical(dtt_date(Sys.time()[-1]), Sys.Date()[-1])
  expect_identical(dtt_date(NA_POSIXct_), NA_Date_)
  expect_identical(
    dtt_date(as.POSIXct("1970-01-03 00:00:00", tz = "Etc/GMT+8")),
    as.Date("1970-01-03")
  )
  expect_identical(
    dtt_date(as.POSIXct("1970-01-03 23:59:59", tz = "Etc/GMT+8")),
    as.Date("1970-01-03")
  )
  expect_identical(
    dtt_date(
      c(as.POSIXct("1970-01-03 23:59:59", tz = "Etc/GMT+8"), NA_POSIXct_)
    ),
    c(as.Date("1970-01-03"), NA_Date_)
  )
})

test_that("date.hms", {
  expect_identical(dtt_date(hms::as_hms(3L))[-1], Sys.Date()[-1])
  expect_identical(dtt_date(NA_hms_), NA_Date_)
  expect_identical(dtt_date(hms::as_hms(0L)), as.Date("1970-01-01"))
  expect_identical(dtt_date(hms::as_hms("23:59:59")), as.Date("1970-01-01"))
  expect_identical(dtt_date(hms::as_hms("24:00:00")), as.Date("1970-01-02"))
  expect_identical(dtt_date(hms::as_hms(0L)), as.Date("1970-01-01"))
  expect_identical(dtt_date(hms::as_hms(3L)), as.Date("1970-01-01"))
  expect_identical(
    dtt_date(hms::as_hms(dtt_units_per_unit())),
    as.Date("1970-01-02")
  )
  expect_identical(dtt_date(hms::as_hms(-1L)), as.Date("1969-12-31"))
  expect_identical(
    dtt_date(hms::as_hms(-dtt_units_per_unit())),
    as.Date("1969-12-31")
  )
  expect_identical(
    dtt_date(hms::as_hms(-dtt_units_per_unit() - 1)),
    as.Date("1969-12-30")
  )
  expect_identical(
    dtt_date(hms::as_hms(-1:0)),
    as.Date(c("1969-12-31", "1970-01-01"))
  )
  expect_identical(
    dtt_date(hms::as_hms(c(-1L, NA))),
    as.Date(c("1969-12-31", NA))
  )
})

test_that("set_date Date", {
  expect_identical(
    dtt_set_date(as.Date("2001-01-01"), as.Date("2002-02-02")),
    as.Date("2002-02-02")
  )
  expect_identical(
    dtt_set_date(
      as.Date(c("2001-01-01", "2003-04-05")),
      as.Date("2002-02-02")
    ),
    as.Date(c("2002-02-02", "2002-02-02"))
  )
  expect_identical(
    dtt_set_date(
      as.Date(c("2001-01-01", "2003-04-05")),
      as.Date(c("2005-02-02", "2007-05-06"))
    ),
    as.Date(c("2005-02-02", "2007-05-06"))
  )

  x <- as.Date(c("2001-01-01", "2003-04-05"))
  dtt_date(x) <- as.Date("2014-02-06")
  expect_identical(x, as.Date(c("2014-02-06", "2014-02-06")))
})

test_that("set_date POSIXct", {
  expect_equal(
    dtt_set_date(
      as.POSIXct("2001-01-01 04:05:06"),
      as.Date("2002-02-02")
    ),
    as.POSIXct("2002-02-02 04:05:06"),
    ignore_attr = TRUE
  )
  expect_equal(
    dtt_set_date(
      as.POSIXct("2001-01-01 04:05:06", tz = "PST8PDT"),
      as.Date("2002-02-02")
    ),
    as.POSIXct("2002-02-02 04:05:06", tz = "PST8PDT"),
    ignore_attr = TRUE
  )
})