iCal file not importable

[larseggert]

Describe the issue

On https://datatracker.ietf.org/wg/scone/meetings/, the ical file for the interim, i.e., https://datatracker.ietf.org/meeting/interim-2025-scone-01/sessions/scone.ics, downloads a file that Apple Calendar won't import.

scone.ics.zip

Code of Conduct

• I agree to follow the IETF's Code of Conduct

[jennifer-richards]

Ew - we have a few problems there. The one causing the failure is the None on the last line here:

BEGIN:VCALENDAR
VERSION:2.0
METHOD:PUBLISH
PRODID:-//IETF//datatracker.ietf.org ical agenda//EN
NoneBEGIN:VEVENT
[file continues...]

We have some other lint (lines not folded, incorrect line terminators) that are probably tolerated, but should be fixed. Those should probably be added to the refactor-it-all issue if they're not fixed here #5393

[jennifer-richards]

The glitch here is caused by the meeting time zone being "GMT" rather than "UTC". The None in the ical is caused by {{ schedule.meeting.vtimezone }} being interpolated, and GMT has no vtimezone(). In the short term, we need to disable GMT as a choice.

In the longer term, we need to fix our timestamps for the UTC case - RFC 5545 requires special handling of those.

[jennifer-richards]

Correction: we already fixed the handling of UTC timestamps. PR #8506 handles GMT as a synonym for UTC as a meeting time zone and should fix this issue.