I have implemented a fix for the code that fails the following tests:

• ch.qos.logback.classic.joran.JoranConfiguratorTest,
• ch.qos.logback.core.rolling.helper.RollingCalendarTest

RollingCalendar had an issue when detecting collisions - there was a case when the first day of a year is not exactly within the first week of a year.

JoranConfigurator did not correctly resolve appender refs (eg. AsyncAppenderBase was started too early, before all appenders were attached to it) and I delayed the start of appenders after the whole configuration is built.

I have added a pull request with my fixes on GitHub.

https://github.com/qos-ch/logback/pull/518