The form sent naive "YYYY-MM-DDTHH:MM" to the LNbits events backend,
where _to_unix (nostr_publisher.py) assumes UTC when tzinfo is None.
So 08:00 entered in CEST got stored as 08:00 UTC, and the NIP-52 start
tag landed on the relays at the wrong instant — the detail page then
re-localized it to 10:00 (offset doubly applied).
Stamp the wall-clock value with the user's UTC offset before sending so
the backend builds the correct unix and the detail page renders the
intended wall-clock. Seconds (`:00`) included for pre-3.11 Python
fromisoformat compatibility. Round-trips through edit mode unchanged:
splitDateTime trims to "HH:MM" so the suffix drops cleanly.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
