Convert iCal to HTML or plaintext in Java

I'm looking for a Java API to convert ICS (aka iCal) attachments to nicely formatted HTML or plaintext for display purposes. Ideally, it would be able to handle:

• Converting dates to a specified timezone.
• Expanding recurrence patterns into human readable sentences.
• Multiple VCALENDAR records in a single file.

I'm looking at iCal4j, which has a nice DOM parser, but no way to serialize to anything but iCal.