Add a USelectMenu for displayTimezone in Event Details (defaults to
America/Toronto). On submit, convert each datetime-local string
(startDate, endDate, registrationDeadline, earlyBirdDeadline) from the
event's TZ to a UTC ISO string so the wall-clock time the admin entered
is preserved regardless of their browser TZ. On edit, render stored
UTC back through the event's TZ so the round-trip is stable.
Reuses TIMEZONE_OPTIONS from ~/config/timezones and the picker pattern
from member/profile.vue. Auto-imported helpers from app/utils/timezones
do the math via Intl.
Jennie Robinson Faber
a76ba2f8c7