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https://issues.apache.org/jira/browse/NIFI-14356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17934366#comment-17934366
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Malte commented on NIFI-14356:
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Pull Request [#9796|https://github.com/apache/nifi/pull/9796]
> Add missing YearMonth and Year queries to DateTimeFormatter
> -----------------------------------------------------------
>
> Key: NIFI-14356
> URL: https://issues.apache.org/jira/browse/NIFI-14356
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 2.0.0, 2.1.0, 2.2.0
> Environment: OS: Ubuntu 24.04
> Reporter: Malte
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Apache NiFi 2 has replaced
> [SimpleDateFormat|https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/text/SimpleDateFormat.html]
> with
> [DateTimeFormatter|https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/time/format/DateTimeFormatter.html]
> for the [date
> functions|https://nifi.apache.org/nifi-docs/expression-language-guide.html#dates]
> in the expression language. The
> [parseToInstant|https://github.com/apache/nifi/blob/fc04d49057d5208d70342c15ee1e18ea545b14aa/nifi-commons/nifi-utils/src/main/java/org/apache/nifi/util/FormatUtils.java#L240C27-L240C41]
> method of the
> [FormatUtils|https://github.com/apache/nifi/blob/fc04d49057d5208d70342c15ee1e18ea545b14aa/nifi-commons/nifi-utils/src/main/java/org/apache/nifi/util/FormatUtils.java#L35C14-L35C25]
> class which is used by the expression language only includes temporal
> queries for the types Instant, LocalDateTime, LocalDate and LocalTime. So
> that patterns like 'yyyy' or 'yyyyMM' will throw a DateTimeParseException
> (regardless of the date string). Actually the example
> ({_}${year:toDate('yyyy', 'GMT')}{_}) from the NiFi 2 [expression language
> documentation|https://nifi.apache.org/nifi-docs/expression-language-guide.html#todate]
> throws an exception.
> I propose to add temporal queries for Year and YearMonth as well.
> I will provide a PR for this minor change and link it here.
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