# pydantic.errors.DatetimeError: value is not a valid datetime

- **ID:** `python/pydantic-datetime-timezone-naive`
- **Domain:** python
- **Category:** data_error
- **Verification:** ai_generated
- **Fix Rate:** 80%

## Root Cause

A datetime field with timezone-aware requirement receives a naive datetime (no timezone info).

## Version Compatibility

| Version | Status | Introduced | Deprecated |
|---------|--------|------------|------------|
| 2.x | active | — | — |

## Workarounds

1. **** (95% success)
   ```
   Use timezone-aware datetime: datetime.now(timezone.utc)
   ```
2. **** (85% success)
   ```
   Allow naive datetime by removing tz constraint from Field
   ```

## Dead Ends

- **** — utcnow returns naive datetime, not timezone-aware. (90% fail)
- **** — This makes it naive, still fails. (80% fail)