Github user holdenk commented on a diff in the pull request:
https://github.com/apache/spark/pull/14398#discussion_r72879633
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
---
@@ -875,11 +877,11 @@ object DateTimeUtils {
val hh = seconds / 3600
val mm = seconds / 60 % 60
val ss = seconds % 60
- val nano = millisOfDay % 1000 * 1000000
+ val calendar = Calendar.getInstance(tz)
- // create a Timestamp to get the unix timestamp (in UTC)
- val timestamp = new Timestamp(year - 1900, month - 1, day, hh, mm,
ss, nano)
- guess = (millisLocal - timestamp.getTime).toInt
+ calendar.set(year, month, day, hh, mm, ss)
--- End diff --
So DST is probably ok and my tests are just borked - so lets go with the
new calendar approach and I'll fix it to preserve ms information.
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