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https://issues.apache.org/jira/browse/FLINK-36941?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17911716#comment-17911716
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Yiyu Tian commented on FLINK-36941:
-----------------------------------
Other functions that still use SimpleDateFormat are:
*CONVERT_TZ*
convertTz(String dateStr, String tzFrom, String tzTo), which eventually calls
formatTimestampMillis(long ts, String format, TimeZone tz).
[code|[https://github.com/apache/flink/blob/5e5d0d5d2cd322ae53ad909dd075f978ca85ccd2/flink-table/flink-table-common/src/main/java/org/apache/flink/table/utils/DateTimeUtils.java#L729],]
which uses SimpleDateFormat.
*UNIX_TIMESTAMP*
unixTimestamp(String dateStr, TimeZone tz) eventually calls calls
internalParseTimestampMillis(String dateStr, String format, TimeZone tz), which
uses SimpleDateFormat.
[link|[http:/https://github.com/apache/flink/blob/5e5d0d5d2cd322ae53ad909dd075f978ca85ccd2/flink-table/flink-table-common/src/main/java/org/apache/flink/table/utils/DateTimeUtils.java#L960|https://github.com/apache/flink/blob/5e5d0d5d2cd322ae53ad909dd075f978ca85ccd2/flink-table/flink-table-common/src/main/java/org/apache/flink/table/utils/DateTimeUtils.java#L960]]
unixTimestamp(String dateStr, String format, TimeZone tz) eventually calls
internalParseTimestampMillis(String dateStr, String format, TimeZone tz), same
as above, which uses SimpleDateFormat.
*FROM_UNIXTIME*
formatUnixTimestamp(long unixtime, TimeZone tz) eventually calls
formatUnixTimestamp(long unixtime, String format, TimeZone tz), which uses
SimpleDateFormat.
[link|https://github.com/apache/flink/blob/5e5d0d5d2cd322ae53ad909dd075f978ca85ccd2/flink-table/flink-table-common/src/main/java/org/apache/flink/table/utils/DateTimeUtils.java#L1432]
formatUnixTimestamp(long unixtime, String format, TimeZone tz) uses
SimpleDateFormat, same as above. .
> Fix Doc for DATE_FORMAT
> -----------------------
>
> Key: FLINK-36941
> URL: https://issues.apache.org/jira/browse/FLINK-36941
> Project: Flink
> Issue Type: Bug
> Components: Documentation
> Reporter: Yiyu Tian
> Assignee: Yiyu Tian
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.19.2, 1.20.1
>
>
> The documentation for DATE_FORMAT is outdated.
> https://github.com/apache/flink/blob/6951686be5691dc855b6d07d575535ac239670da/docs/data/sql_functions.yml#L645
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