A good Business calendar library in Java? [closed]

Answer 1

While thinking of the same problem I found out a Quartz Calendar. It has several problems like:

1. It is an implementation part of a scheduling library - using it apart from all quartz just as a holiday calendar is a bit hackish.
2. It has getNextIncludeTime method but no getPrevIncludeTime.
3. It has ugly and inconsistent API - AnnualCalendar has getter and setter that takes ArrayList, MonthlyCalendar has getter and setter that takes boolean[], both of them just expose class internals.
4. It has some poorly documented issues - you can chain calendars, but order of chaining is important - DailyCalendar created on AnnualCalendar is OK, AnnualCalendar created on DailyCalendar will break (hang, I think).

Still it is the best thing I could find. So maybe just take the source code, fix what's wrong and add what's missing?