This is basically a more generic replacement for UnsynchronizedStaticDateFormatter. The problem is not specific to DateFormat, but to java.text.Format in general:
Formats are generally not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.
(https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/text/Format.html)
So we should detect such usages of Format (and subclasses) instead of just DateFormat or SimpleDateFormat.
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