c6eea88002
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The root cause was that drag operations sent naive local time to the backend, which the backend interpreted using the SERVER's local timezone rather than the USER's timezone. This caused different behavior between development and production servers in different timezones. **Frontend Changes:** - Convert naive datetime from drag operations to UTC before sending to backend - Use client-side Local timezone to properly convert user's intended times - Handle DST transition edge cases with fallback logic **Backend Changes:** - Update parse_event_datetime to treat incoming times as UTC (no server timezone conversion) - Update series handlers to expect UTC times from frontend - Remove server-side Local timezone dependency for event parsing **Result:** - Consistent behavior across all server environments regardless of server timezone - Drag operations now correctly preserve user's intended local times - Fixes "4 hours too early" issue in production drag-and-drop operations 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>