Github user viirya commented on a diff in the pull request:

    https://github.com/apache/spark/pull/21505#discussion_r193687670
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/DateTimeUtils.scala
 ---
    @@ -114,20 +114,19 @@ object DateTimeUtils {
       }
     
       private val threadLocalComputedCalendarsMap =
    -    new ThreadLocal[mutable.Map[TimeZone, (Calendar, Long)]] {
    -      override def initialValue(): mutable.Map[TimeZone, (Calendar, Long)] 
= {
    -        mutable.Map[TimeZone, (Calendar, Long)]()
    +    new ThreadLocal[mutable.Map[TimeZone, Calendar]] {
    +      override def initialValue(): mutable.Map[TimeZone, Calendar] = {
    +        mutable.Map[TimeZone, Calendar]()
           }
         }
     
       def getCalendar(timeZone: TimeZone): Calendar = {
    -    val (c, timeInMillis) = threadLocalComputedCalendarsMap.get()
    +    val c = threadLocalComputedCalendarsMap.get()
           .getOrElseUpdate(timeZone, {
    -        val c = Calendar.getInstance(timeZone)
    -        (c, c.getTimeInMillis)
    +        Calendar.getInstance(timeZone)
           })
         c.clear()
    -    c.setTimeInMillis(timeInMillis)
    +    c.setTimeInMillis(System.currentTimeMillis())
    --- End diff --
    
    oh, Calendar.getTimeInMillis and setTimeInMillis are also UTC-based.


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