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https://issues.apache.org/jira/browse/SPARK-20166?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-20166:
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Assignee: Apache Spark
> Use XXX for ISO timezone instead of ZZ which is FastDateFormat specific in
> CSV/JSON time related options
> --------------------------------------------------------------------------------------------------------
>
> Key: SPARK-20166
> URL: https://issues.apache.org/jira/browse/SPARK-20166
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Hyukjin Kwon
> Assignee: Apache Spark
> Priority: Trivial
>
> We can use {{XXX}} format instead of {{ZZ}}. {{ZZ}} seems a
> {{FastDateFormat}} specific Please see
> https://docs.oracle.com/javase/7/docs/api/java/text/SimpleDateFormat.html#iso8601timezone
> and
> https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/time/FastDateFormat.html
> {{ZZ}} supports "ISO 8601 extended format time zones" but it seems
> {{FastDateFormat}} specific option.
> It seems we better replace {{ZZ}} to {{XXX}} because they look use the same
> strategy -
> https://github.com/apache/commons-lang/blob/8767cd4f1a6af07093c1e6c422dae8e574be7e5e/src/main/java/org/apache/commons/lang3/time/FastDateParser.java#L930.
>
> I also checked the codes and manually debugged it for sure. It seems both
> cases use the same pattern {code}( Z|(?:[+-]\\d{2}(?::)\\d{2})) {code}.
> Note that this is a fix about documentation not the behaviour change because
> {{ZZ}} seems invalid date format in {{SimpleDateFormat}} as documented in
> {{DataFrameReader}}:
> {quote}
> * <li>`timestampFormat` (default `yyyy-MM-dd'T'HH:mm:ss.SSSZZ`): sets the
> string that
> * indicates a timestamp format. Custom date formats follow the formats at
> * `java.text.SimpleDateFormat`. This applies to timestamp type.</li>
> {quote}
> {code}
> scala> new
> java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX").parse("2017-03-21T00:00:00.000-11:00")
> res4: java.util.Date = Tue Mar 21 20:00:00 KST 2017
> scala> new
> java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX").parse("2017-03-21T00:00:00.000Z")
> res10: java.util.Date = Tue Mar 21 09:00:00 KST 2017
> scala> new
> java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZ").parse("2017-03-21T00:00:00.000-11:00")
> java.text.ParseException: Unparseable date: "2017-03-21T00:00:00.000-11:00"
> at java.text.DateFormat.parse(DateFormat.java:366)
> ... 48 elided
> scala> new
> java.text.SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSZZ").parse("2017-03-21T00:00:00.000Z")
> java.text.ParseException: Unparseable date: "2017-03-21T00:00:00.000Z"
> at java.text.DateFormat.parse(DateFormat.java:366)
> ... 48 elided
> {code}
> {code}
> scala>
> org.apache.commons.lang3.time.FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSSXXX").parse("2017-03-21T00:00:00.000-11:00")
> res7: java.util.Date = Tue Mar 21 20:00:00 KST 2017
> scala>
> org.apache.commons.lang3.time.FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSSXXX").parse("2017-03-21T00:00:00.000Z")
> res1: java.util.Date = Tue Mar 21 09:00:00 KST 2017
> scala>
> org.apache.commons.lang3.time.FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSSZZ").parse("2017-03-21T00:00:00.000-11:00")
> res8: java.util.Date = Tue Mar 21 20:00:00 KST 2017
> scala>
> org.apache.commons.lang3.time.FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSSZZ").parse("2017-03-21T00:00:00.000Z")
> res2: java.util.Date = Tue Mar 21 09:00:00 KST 2017
> {code}
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