Calendar File Guides
Clear answers for opening, importing, troubleshooting, and repairing ICS calendar files.
Importing vs. subscribing to an ICS calendar
Importing creates a one-time copy. Subscribing keeps a separate calendar connected to a URL. Learn which option fits your calendar.
7 min readRead the guideLatest guides
Practical explanations grounded in calendar standards and documented app behavior.
See how timezone identifiers, UTC values, and daylight saving rules change the time shown by calendar apps.
2026-10-28 8 min readTroubleshootingWhy won’t my ICS file import?Start with the file boundaries, required event fields, and the lines calendar apps most often reject.
2026-10-24 6 min readRecurrenceWhy is one date missing from a recurring event?Understand how RRULE, EXDATE, and recurrence exceptions work together.
2026-10-19 9 min readCompatibilityWhy the same ICS file looks different in each calendar appA practical look at differences that are documented, verified, or inferred.
2026-10-14 10 min readTroubleshootingWhat causes duplicate events after import?Learn when duplicate UIDs, repeated imports, and subscriptions create extra events.
2026-10-08 5 min readICS BasicsHow to read an ICS file without importing itThe small set of fields that tells you what an event is, when it happens, and whether it repeats.
2026-10-02 6 min readTime ZonesFloating time in calendar files, explainedA time with no timezone can be useful, but every calendar app must decide how to display it.
2026-09-27 7 min readBrowse by the problem you see
Start with the symptom. The technical details can wait until they are useful.