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bitfireAT / ical4android

Allows usage of iCalendar files with the Android calendar provider
GNU General Public License v3.0
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Getting "Invalid date 'APRIL 31'" when specification of time for EXDATE is missing #147

Closed rfc2822 closed 6 months ago

rfc2822 commented 6 months ago

Discussed in https://github.com/bitfireAT/ical4android/discussions/146

Originally posted by **bwildenhain** March 27, 2024 Hi, when trying to sync a Nextcloud calender, which contains the recurring event from [btest.ics.txt](https://github.com/bitfireAT/davx5-ose/files/14772734/btest.ics.txt) I get the following error message: `Invalid date 'APRIL 31'` Although https://icalendar.org/validator.html, GNOME Evolution and Nextcloud Calendar didn't complain and excluded the 31st of may (sic!), the file using only a date where date + time where required for the EXDATE line, so `EXDATE;VALUE=DATE:20240531` seems to be wrong wrong, while `EXDATE;TZID=Europe/Berlin:20240531T114500` was working. The following debug output was created: [debug-info.txt](https://github.com/bitfireAT/davx5-ose/files/14773709/debug-info.txt) I wonder whether it might be a good idea to output a more understandable error message or to handle this more gracefully by accepting the file nevertheless and interpreting it accordingly. I have no experience in kotlin programming, so I didn't look into the actual source code.