Github user ckadner commented on the issue:
https://github.com/apache/spark/pull/13652
I think this is a good "best effort" fix for the round-trip conversion
```int -> java.sql.Date -> int```.
It may also be worth testing the round-trip conversion ```java.sql.Date ->
int -> java.sql.Date```:
```scala
test("fromJavaDate toJavaDate in all timezones") {
val debug = true
val years = 1900 to 2020
val dates : Seq[String] = for {
year <- years
month <- 1 to 12
day <- 1 to 31
} yield new Date(year-1900, month-1, day).toString
def testDateIsEqual(date: String): Boolean = {
val d1 = Date.valueOf(date)
val d2 = toJavaDate(fromJavaDate(d1))
d2 === d1
}
def testStringEquals(date: String): Boolean = {
val d1 = Date.valueOf(date)
val d2 = toJavaDate(fromJavaDate(d1))
d2.toString === d1.toString
}
// make sure all converted Dates have a matching String representation
(ignores time component)
for (tz <- DateTimeTestUtils.ALL_TIMEZONES) {
DateTimeTestUtils.withDefaultTimeZone(tz) {
assert(dates.filterNot(testStringEquals _).isEmpty)
}
}
// find Dates that don't convert to an equal Date (non-matching time
component)
val nonEqualDatesWithTZ = for {
tz <- DateTimeTestUtils.ALL_TIMEZONES
badDate <- DateTimeTestUtils.withDefaultTimeZone(tz) {
dates.filterNot(testDateIsEqual _) }
} yield (badDate, tz)
// scalastyle:off println
if (debug) {
println(s"${nonEqualDatesWithTZ.size} incorrect conversions
${years.start}..${years.end}")
nonEqualDatesWithTZ.foreach { case (d, t) => println(s"${d} in
${t.getID}") }
}
// scalastyle:on println
}
```
Output when ```debug == true```
```
135 incorrect conversions 1900..2020:
1939-11-19 in Africa/Algiers
1900-01-01 in Africa/Ceuta
1943-03-21 in Africa/Windhoek
1922-01-01 in America/Bahia_Banderas
1922-01-01 in America/Cancun
1996-10-27 in America/Chihuahua
1997-10-26 in America/Chihuahua
1981-03-29 in America/Danmarkshavn
1982-03-28 in America/Danmarkshavn
1983-03-27 in America/Danmarkshavn
1984-03-25 in America/Danmarkshavn
1985-03-31 in America/Danmarkshavn
1986-03-30 in America/Danmarkshavn
1987-03-29 in America/Danmarkshavn
1988-03-27 in America/Danmarkshavn
1989-03-26 in America/Danmarkshavn
1990-03-25 in America/Danmarkshavn
1991-03-31 in America/Danmarkshavn
1992-03-29 in America/Danmarkshavn
1993-03-28 in America/Danmarkshavn
1994-03-27 in America/Danmarkshavn
1995-03-26 in America/Danmarkshavn
1965-10-31 in America/Dawson
1969-10-26 in America/Indiana/Tell_City
1970-10-25 in America/Indiana/Tell_City
1965-10-31 in America/Inuvik
1999-10-31 in America/Iqaluit
1945-09-30 in America/Juneau
1969-10-26 in America/Juneau
1970-10-25 in America/Juneau
1971-10-31 in America/Juneau
1972-10-29 in America/Juneau
1973-10-28 in America/Juneau
1974-10-27 in America/Juneau
1975-10-26 in America/Juneau
1976-10-31 in America/Juneau
1977-10-30 in America/Juneau
1978-10-29 in America/Juneau
1979-10-28 in America/Juneau
1981-10-25 in America/Juneau
1982-10-31 in America/Juneau
1922-01-01 in America/Mexico_City
1996-10-27 in America/Ojinaga
1997-10-26 in America/Ojinaga
1945-09-30 in America/Pangnirtung
1980-10-26 in America/Pangnirtung
1981-10-25 in America/Pangnirtung
1982-10-31 in America/Pangnirtung
1983-10-30 in America/Pangnirtung
1984-10-28 in America/Pangnirtung
1985-10-27 in America/Pangnirtung
1986-10-26 in America/Pangnirtung
1987-10-25 in America/Pangnirtung
1988-10-30 in America/Pangnirtung
1989-10-29 in America/Pangnirtung
1990-10-28 in America/Pangnirtung
1991-10-27 in America/Pangnirtung
1992-10-25 in America/Pangnirtung
1993-10-31 in America/Pangnirtung
1994-10-30 in America/Pangnirtung
1999-10-31 in America/Pangnirtung
1950-04-16 in America/Santarem
1945-09-30 in America/Sitka
1969-10-26 in America/Sitka
1970-10-25 in America/Sitka
1971-10-31 in America/Sitka
1972-10-29 in America/Sitka
1973-10-28 in America/Sitka
1974-10-27 in America/Sitka
1975-10-26 in America/Sitka
1976-10-31 in America/Sitka
1977-10-30 in America/Sitka
1978-10-29 in America/Sitka
1979-10-28 in America/Sitka
1980-10-26 in America/Sitka
1981-10-25 in America/Sitka
1982-10-31 in America/Sitka
1965-10-31 in America/Whitehorse
1900-01-01 in Antarctica/Casey
1900-01-01 in Antarctica/Davis
2009-10-18 in Antarctica/Davis
2011-10-28 in Antarctica/Davis
1900-01-01 in Antarctica/DumontDUrville
1900-01-01 in Antarctica/Mawson
1900-01-01 in Antarctica/Syowa
1900-01-01 in Antarctica/Vostok
2001-09-29 in Asia/Choibalsan
2002-09-28 in Asia/Choibalsan
2003-09-27 in Asia/Choibalsan
2004-09-25 in Asia/Choibalsan
2005-09-24 in Asia/Choibalsan
2006-09-30 in Asia/Choibalsan
1916-11-01 in Atlantic/Azores
1916-11-01 in Atlantic/Madeira
1917-10-21 in Atlantic/Reykjavik
1918-11-16 in Atlantic/Reykjavik
1919-11-16 in Atlantic/Reykjavik
1921-06-23 in Atlantic/Reykjavik
1965-10-31 in Canada/Yukon
1900-01-01 in Europe/Brussels
1900-01-01 in Europe/Gibraltar
1916-10-01 in Europe/Kaliningrad
1916-10-01 in Europe/Kaliningrad
1990-07-01 in Europe/Kiev
1990-07-01 in Europe/Kiev
1922-10-08 in Europe/Luxembourg
1924-10-05 in Europe/Luxembourg
1925-10-04 in Europe/Luxembourg
1926-10-03 in Europe/Luxembourg
1927-10-02 in Europe/Luxembourg
1928-10-07 in Europe/Luxembourg
1900-01-01 in Europe/Madrid
1992-09-27 in Europe/Minsk
1911-03-11 in Europe/Paris
1990-07-01 in Europe/Uzhgorod
1990-07-01 in Europe/Uzhgorod
1917-10-21 in Iceland
1918-11-16 in Iceland
1919-11-16 in Iceland
1921-06-23 in Iceland
1900-01-01 in Indian/Kerguelen
1922-01-01 in Mexico/General
1900-01-01 in Pacific/Apia
1950-01-02 in Pacific/Apia
2011-09-25 in Pacific/Apia
1900-01-01 in Pacific/Enderbury
1979-10-02 in Pacific/Enderbury
1900-01-01 in Pacific/Fakaofo
1901-01-02 in Pacific/Fakaofo
1900-01-01 in Pacific/Kiritimati
1979-10-02 in Pacific/Kiritimati
1911-03-11 in ECT
1900-01-01 in MIT
1950-01-02 in MIT
2011-09-25 in MIT
```
The extra debug stuff should be removed of course.
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