This bug have been fixed in poco repo and extra/poco is still old version and this bug leads clickhouse failed to start. So I think it is better to update this submodule as soon as possible. Thinks.

The bug is a wrong typo in poco DataTimeFormat.cpp, see my comments for more details.

Hi
Recently, I need add a new type of log file so that I create a new FileChannel like this:

which uses rotation strategy of monthly and CRITICAL log level. I also add new LOG_CRITICAL macro. All of these work correctly for the first day. But yesterday the engine says "DB::Exception: Syntax error: Invalid DateTimeString:Sunday, 10 Mar 19 09:23:15 GMT."

This date information is written into log file according to rotation strategy. So I guess there may be something wrong when engine writes new logs to the file.