CalendarSet version 5 includes the original API (no change needed in your existing code) and adds many new features:
Compatibility with 32-bit and 64-bit modes (4D v15, v16 and above)
Views: “old” month view (as in previous versions), iCal type views (day, week, month)
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Properties to fine-tune all parts of the calendars, event handling, etc.
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New
"Agenda" API (compatible with old 4D Agenda plugin calls)