What version of OpenRewrite are you using?

I am using

• OpenRewrite v8.69.0
• Maven/Gradle plugin v7.23.0
• Static Analysis: v2.24.0

How are you running OpenRewrite?

I am using the Gradle plugin, and my project is a single module project.

What is the smallest, simplest way to reproduce the problem?

public class Example {
    void example() {
        var dtf = DateTimeFormatter.ofPattern("YYYY-ww");
    }
}

What did you expect to see?

Because the format uses week-of-year, I expect YYYY (week year) to be left alone.

public class Example {
    void example() {
        var dtf = DateTimeFormatter.ofPattern("YYYY-ww");
    }
}

What did you see instead?

When used with week-of-year (ww), week-year (YYYY) is valid. However, ReplaceWeekYearWithYear replaces it in cases where it shouldn't, creating formats the author probably does not intend. In the example below, yyyy-ww uses calendar year and week-of-year instead of the desired week-year and week-of-year.

public class Example {
    void example() {
        var dtf = DateTimeFormatter.ofPattern("yyyy-ww");
    }
}

What is the full stack trace of any errors you encountered?

No errors, stack traces, or other unexpected output, just incorrect behavior.

Are you interested in contributing a fix to OpenRewrite?

Yes!