https://www.pistack.xyz/tags/icalendar/ Recent content in Icalendar on Pi Stack Hugo en-us Sat, 10 Oct 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-10-10-icalendar-vcard-libraries-ical4j-icaljs-libical-ezvcard-comparison/ Sat, 10 Oct 2026 00:00:00 +0000 https://www.pistack.xyz/posts/2026-10-10-icalendar-vcard-libraries-ical4j-icaljs-libical-ezvcard-comparison/ <p>Calendar synchronisation looks like a solved problem until you ship it. Then you discover that &ldquo;repeat every second Tuesday until December&rdquo; is a recurrence rule with its own grammar, that a recurring event&rsquo;s timezone lives in a <code>VTIMEZONE</code> block that some clients omit, that an all-day event is a <code>DATE</code> while a timed event is a <code>DATE-TIME</code> and mixing them shifts everything by a day, and that one vendor writes vCard 3.0 while another writes 4.0 with the photo embedded as base64 and a third expects a URI.</p>