Github user gatorsmile commented on a diff in the pull request: https://github.com/apache/spark/pull/17997#discussion_r117178061 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala --- @@ -603,7 +603,13 @@ object DateTimeUtils { */ private[this] def getYearAndDayInYear(daysSince1970: SQLDate): (Int, Int) = { // add the difference (in days) between 1.1.1970 and the artificial year 0 (-17999) - val daysNormalized = daysSince1970 + toYearZero + var daysSince1970Tmp = daysSince1970 + // In history,the period(5.10.1582 ~ 14.10.1582) is not exist --- End diff -- `In history,the period(5.10.1582 ~ 14.10.1582) is not exist` -> `Since Julian calendar was replaced with the Gregorian calendar, the 10 days after Oct. 4 were skipped.`
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