RFCs describe all formats in a formal way and also often includes examples, but when it comes to the question if e.g. a ics file found in the wild is valid or not, external sources like validators are very useful for debugging.

Here you will find a collection of the ones, we use and think are useful to you too:

iCalendar Validators


Based on the current iCal4J version by Ben Fortuna

Note: this service is unavailable as of 2018-09-27

Z Content

Z Content (Dan Cogliano) is a developer of iCalendar tools for the Joomla Content Management System.

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