test_that("is.Date works as expected", {
  expect_false(is.Date(234))
  expect_false(is.Date(as.POSIXct("2008-08-03 13:01:59", tz = "UTC")))
  expect_false(is.Date(as.POSIXlt("2008-08-03 13:01:59", tz = "UTC")))
  expect_true(is.Date(Sys.Date()))
  expect_false(is.Date(minutes(1)))
  expect_false(is.Date(dminutes(1)))
  expect_false(is.Date(interval(
    as.POSIXct("2008-08-03 13:01:59", tz = "UTC"),
    as.POSIXct("2009-08-03 13:01:59", tz = "UTC")
  )))
})

test_that("as_date works", {
  dt1 <- as.POSIXct("2010-08-03 00:59:59.23")
  dt2 <- as.POSIXct("2010-08-03 00:59:59.23", tz = "Europe/London")
  dt3 <- as.POSIXct("2010-11-03 00:59:59.23")
  dt4 <- as.POSIXct("2010-11-03 00:59:59.23", tz = "Europe/London")
  expect_equal(as_date(dt1), as_date("2010-08-03"))
  expect_equal(as_date(dt2), as_date("2010-08-03"))
  expect_equal(as_date(dt3), as_date("2010-11-03"))
  expect_equal(as_date(dt4), as_date("2010-11-03"))
  expect_equal(as_date(dt1), as.Date("2010-08-03"))
  expect_equal(as_date(dt2), as.Date("2010-08-03"))
  expect_equal(as_date(dt3), as.Date("2010-11-03"))
  expect_equal(as_date(dt4), as.Date("2010-11-03"))
  expect_equal(as_date(10), ymd("1970-01-11"))

  expect_equal(as_date("2010-08-03 00:59:59.23"), as_date("2010-08-03"))
  expect_equal(as_date("2010-11-03 00:59:59.23"), as_date("2010-11-03"))

  ## tz is ignored
  expect_equal(as_date("2010-08-03 00:59:59.23"), as_date("2010-08-03"))

  ## can supply custom format
  expect_equal(as_date("03/04/2015", format = "%d/%m/%Y"), as_date("2015-04-03"))

  ## Zulu time is part of the instant spec, so we compute on the instant object
  ## and not on the textual representation.
  expect_equal(as_date("2010-08-03 00:59:59.23Z-02"), as_date("2010-08-03"))
  expect_equal(as_date("2010-08-03 00:59:59.23Z+02"), as_date("2010-08-02"))
  expect_equal(as_date("2010-08-03 00:59:59.23Z+08"), as_date("2010-08-02"))
})

test_that("as_date works with multiple formats", {
  date <- c("2020-10-02", "03/10/2020")
  expect_warning(expect_equal(as_date(date, format = "%Y-%m-%d"), c(as.Date(date[1]), NA)))
  expect_equal(as_date(date, format = c("%Y-%m-%d", "%d/%m/%Y")), as.Date(c("2020-10-02", "2020-10-03")))
})

test_that("c.Date deals correctly with empty vectors", {
  expect_equal(c(Date()), Date())
  expect_equal(c(Date(), Date()), Date())
  expect_equal(c(Date(), POSIXct()), Date())
  expect_equal(c(ymd("2021-01-01"), NULL, c()), ymd("2021-01-01"))
  expect_equal(
    c(ymd("2021-01-01"), Date(), ymd("2021-01-02")),
    ymd(c("2021-01-01", "2021-01-02"))
  )
  expect_equal(
    c(ymd("2021-01-01"), POSIXct(), ymd("2021-01-02"), NULL),
    ymd(c("2021-01-01", "2021-01-02"))
  )

  d <- ymd("1999-01-01")
  expect_equal(
    c(d, as.POSIXct("1999-01-01 01:02:03", tz = "America/New_York")),
    ymd("1999-01-01", "1999-01-01")
  )
  expect_equal(
    c(d, as.POSIXct("1999-01-01 23:50:03", tz = "America/New_York")),
    ymd("1999-01-01", "1999-01-01")
  )
  expect_equal(
    c(d, as.POSIXct("1999-01-01 00:01:03", tz = "Europe/Berlin")),
    ymd("1999-01-01", "1999-01-01")
  )
})


test_that("c.Date deals correctly with heterogeneous date-time classes", {
  d <- make_date(2000, 1, 1)
  dt <- make_datetime(2000, 1, 1, tz = "Europe/Berlin")
  expect_equal(c(d, dt), make_date(c(2000, 2000), 1, 1))
  expect_equal(c(d, list(dt)), make_date(c(2000, 2000), 1, 1))
  expect_equal(c(d, list(dt, list(dt))), make_date(c(2000, 2000, 2000), 1, 1))
  dt <- make_datetime(2000, 1, 1, tz = "UTC")
  expect_equal(c(d, list(dt)), make_date(c(2000, 2000), 1, 1))
})


test_that("as_date parsers with exact formats", {
  ## #1097
  expect_equal(
    as_date("blabla2022-xyz01-03", format = "blabla%Y-xyz%m-%d"),
    ymd("2022-01-03"))
  expect_equal(
    as_date(c("2022-01-01", "blabla2022-xyz01-03"), format = c("%Y-%m-%d", "blabla%Y-xyz%m-%d")),
    ymd(c("2022-01-01", "2022-01-03")))
})