Pierre's field test: the agenda announces "10:30 → 12:30", the list only
said "à 10:30". The end date was already parsed and already in the
payload; it was purely missing from the display.
Naively rendering start → end would have been wrong four ways, all
measured against the real parser:
- no DTEND: the parser sets fin === debut, so "de 10:30 à 10:30"
- crossing midnight: "samedi de 22:00 à 02:00" hides the end date
- all-day: DTEND is EXCLUSIVE (RFC 5545), so a one-day event carries
the next day, and a 18→20 festival carries the 21st
The last one is the dangerous one: it yields a wrong date, not just an
ugly one. The end day is therefore fin minus one day, computed from
local components since a floating date has no timezone.
DECISIONS.md records the exclusive DTEND for the sibling task, which
fills the town hall's end date field straight from DTEND.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Pierre MartinandClaude Opus 4.8
596b5e22fd