Maxim Gekk created SPARK-31221:
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Summary: Rebase all dates/timestamps in conversion in Java types
Key: SPARK-31221
URL: https://issues.apache.org/jira/browse/SPARK-31221
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.0.0
Reporter: Maxim Gekk
Currently, the fromJavaDate(), toJavaDate(), toJavaTimestamp() and
fromJavaTimestamp() methods of DateTimeUtils perform rebase only dates before
Gregorian cutover date 1582-10-15 assuming that Gregorian calendar has the same
behavior in Java 7 and Java 8 API. The assumption is incorrect, in particular,
in getting zone offsets, for instance:
{code:scala}
scala> java.time.ZoneId.systemDefault
res16: java.time.ZoneId = America/Los_Angeles
scala> java.sql.Timestamp.valueOf("1883-11-10 00:00:00").getTimezoneOffset /
60.0
warning: there was one deprecation warning; re-run with -deprecation for details
res17: Double = 8.0
scala>
java.time.ZoneId.of("America/Los_Angeles").getRules.getOffset(java.time.LocalDateTime.parse("1883-11-10T00:00:00"))
res18: java.time.ZoneOffset = -07:52:58
{code}
Java 7 is not accurate, America/Los_Angeles changed time zone shift from
{code}
-7:52:58
{code}
to
{code}
-8:00
{code}
The ticket aims to perform rebasing for any dates/timestamps independently from
calendar cutover date.
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