>interpretation of LocalTime addition operations and parsing Well, the function itself does a lot of time parsing, so I am nowhere sure if it contains bug or not. Did you mean the test fails at the specific date only?
However, the concurrent execution of tests that alter timezone is not something we intended to do. Technically speaking, JUnit5 has ResourceLock notation (see https://github.com/junit-team/junit5/issues/2142#issuecomment-596199239 ) Vladimir
