Does anybody know any engines for calendar implementation?
For example, which accepts event definition object (it can be iCalendar-style) and current date as input and outputs whether this date matches event definition?
+2
A:
Hmm. Calendaring is hard.
I've had very mixed experiences with iCal4j - it's not too smart about time zones in some places, but after a bit of work it can be just about okay. That will allow you to parse iCal entries.
Beyond that, I'd based everything you possibly can on Joda Time. Definitely avoid the built-in java.util.Date/Calendar classes as far as possible.
Jon Skeet
2009-10-27 12:23:18
+1 for avoiding java.util.Calendar. It is a total piece of crap.
KitsuneYMG
2009-10-27 12:25:56
Thank you, this is useful, but nevertheless, the main point is about figuring out which events are scheduled for particular date (like MS outlook calendar). And I couldn't find any libraries for that, though I doubting that no one has ever solved that problem
glaz666
2009-10-27 14:57:57
@glaz666: iCal4j and a bit of effort should be able to tell you that.
Jon Skeet
2009-10-27 15:19:05