PeriodicRotatingFileHandler does not roll the File on midnight when startet after 12PM

If the Logging is initialized after 12 P.M. the PeriodicRotatingFileHandler does not roll the file on midnight if the suffix '.yyyy-MM-dd' or Period=DAY is being used.

The culprit for this cause is in my unterstanding the usage of Calendar.clear(..) for the 'HOUR_OF_DAY' Field. As stated in http://download.oracle.com/javase/6/docs/api/java/util/Calendar.html#clear(int) the HOUR value will not be cleared in this case.

Probably the HALF_DAY Period setting has the same problem.