BerriAI/litellm · error · HTTPException

Invalid date format: {date_str}. Expected: {expected}

Error message

Invalid date format: {date_str}. Expected: {expected}

What it means

Error "Invalid date format: {date_str}. Expected: {expected}" thrown in BerriAI/litellm.

Source

Thrown at litellm/proxy/spend_tracking/spend_management_endpoints.py:2335

        else:
            if start_date is None or end_date is None:
                raise ProxyException(
                    message="Start date and end date are required",
                    type="bad_request",
                    param="None",
                    code=status.HTTP_400_BAD_REQUEST,
                )
            formats: Final = ["%Y-%m-%d %H:%M:%S", "%Y-%m-%d"] if is_v2 else ["%Y-%m-%d %H:%M:%S"]

            def parse_date(date_str: str) -> datetime:
                date_str = date_str.strip()
                for fmt in formats:
                    try:
                        return datetime.strptime(date_str, fmt).replace(tzinfo=timezone.utc)
                    except ValueError:
                        continue
                expected: Final = "'YYYY-MM-DD' or 'YYYY-MM-DD HH:MM:SS'" if is_v2 else "'YYYY-MM-DD HH:MM:SS'"
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail=f"Invalid date format: {date_str}. Expected: {expected}",
                )

            start_date_obj = parse_date(start_date)
            end_date_obj = parse_date(end_date)

        # Build where conditions
        where_conditions: Final[dict[str, Any]] = {}
        if start_date_obj is not None and end_date_obj is not None:
            where_conditions["startTime"] = {
                "gte": start_date_obj.isoformat(),  # Already in UTC, no need to add Z
                "lte": end_date_obj.isoformat(),
            }

        if team_id is not None:
            where_conditions["team_id"] = team_id

View on GitHub (pinned to 77b7c6c40c)

Solutions

1. Format the date according to the expected format shown in the error (e.g. YYYY-MM-DD).

When it happens

Trigger: Thrown at litellm/proxy/spend_tracking/spend_management_endpoints.py:2335 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of BerriAI/litellm@77b7c6c40c (2026-08-18). Data as JSON: /api/errors/23ee56abb30d239d. Report an issue: GitHub.