[GitHub] MaxGekk commented on a change in pull request #23815: [SPARK-26908][SQL] Fix DateTimeUtils.toMillis and millisToDays

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MaxGekk commented on a change in pull request #23815: [SPARK-26908][SQL] Fix DateTimeUtils.toMillis and millisToDays
URL: https://github.com/apache/spark/pull/23815#discussion_r257514514
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
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 @@ -85,7 +85,7 @@ object DateTimeUtils {
     // SPARK-6785: use Math.floor so negative number of days (dates before 1970)
     // will correctly work as input for function toJavaDate(Int)
     val millisLocal = millisUtc + timeZone.getOffset(millisUtc)
-    Math.floor(millisLocal.toDouble / MILLIS_PER_DAY).toInt
+    Math.floorDiv(millisLocal, MILLIS_PER_DAY).toInt
 
 Review comment:
   > I see, because `floorDiv` rounds towards 0?
   
   For example, if we have an old date (negative in milliseconds) `<old year>-12-31 23:59:59.999456`. `floorDiv` should produce `<old year>-12-31 23:59:59.999` instead of `<old year+1>-01-01 00:00:00.000`. 

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