steveahnahn opened a new pull request, #54593:
URL: https://github.com/apache/airflow/pull/54593
## Summary
Fixes a bug where datetime parameter inputs in the Airflow UI were applying
timezone conversion twice, causing incorrect scheduling times. When users
selected a local time via the datetime picker, the actual trigger time would be
offset by double the timezone difference.
## Problem
1. User picks "5:25 PM" local time in the UI via the datetime selector
2. `DateTimeInput` converts local (Pacific UTC-7 used) to
UTC:"2025-08-16T17:25" → "2025-08-17T00:25:00.000Z"
3. React re-renders, feeding the UTC value back as display value
4. `DateTimeInput` displays "2025-08-17T00:25" as local time
5. User interaction re-triggers onChange again, converting the new datetime
to UTC again (interpreted as local time) "2025-08-17T00:25" →
"2025-08-17T07:25:00.000Z"
6. Resulting in 2 UTC time conversions
## Solution
1. `DateTimeInput`: Remove timezone conversion from onChange handler - pass
through raw user selected values
2. `FieldDateTime`: Handle timezone conversion only once when storing the
final value
3. DAG schedule via UTC timezone, user only sees their local time
## Testing
- Manual testing with Pacific (UTC-7) timezone and verified DAG triggers
execute at correct times
- Confirmed no double conversion in browser console logs
## Related Issues
resolves #54466
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