- Convert local datetime to UTC before sending to backend for non-all-day events
- Keep all-day events unchanged (no timezone conversion needed)
- Add proper timezone conversion using chrono::Local and chrono::Utc
- Include fallback handling if timezone conversion fails
- Add debug logging for timezone conversion issues
This resolves the issue where events appeared 4 hours earlier than expected
due to frontend sending local time but backend treating it as UTC time.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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