### Discussed in https://github.com/apache/airflow/discussions/33345

<div type='discussions-op-text'>

<sup>Originally posted by **vuphamcs** August 11, 2023</sup>
### Description

Is there a variable similar to `prev_start_date_success` but for the previous DAG run’s completion date? The value I’m hoping to retrieve to use within the next DAG run is `2023-08-10 16:04:30`

![image](https://github.com/apache/airflow/assets/1600760/9e2af349-4c3e-47e1-8a1a-9d8827b56f57)


### Use case/motivation

One particular use case is to help guarantee that the next DAG run only queries data that was inserted during the existing DAG run, and not the past DAG run.

```python
prev_ts = context['prev_end_date_success']

sql = f"SELECT * FROM results WHERE created_at > {context['prev_end_date_success']}"
```

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)
</div>
import dill
from airflow.exceptions import (
    AirflowConfigException,
    AirflowException,
    AirflowSkipException,
    DeserializingResultError,
    RemovedInAirflow3Warning,
)
from airflow.models.baseoperator import BaseOperator
from airflow.models.skipmixin import SkipMixin
from airflow.models.taskinstance import _CURRENT_CONTEXT
from airflow.models.variable import Variable
from airflow.operators.branch import BranchMixIn
from airflow.utils import hashlib_wrapper
from airflow.utils.context import context_copy_partial, context_merge
from airflow.utils.operator_helpers import KeywordParameters
from airflow.utils.process_utils import execute_in_subprocess
from airflow.utils.python_virtualenv import prepare_virtualenv, write_python_script
if TYPE_CHECKING:
    from pendulum.datetime import DateTime
    from airflow.utils.context import Context
def is_venv_installed() -> bool:
    """
    Check if the virtualenv package is installed via checking if it is on the path or installed as package.
    :return: True if it is. Whichever way of checking it works, is fine.
    """
    if shutil.which("virtualenv") or importlib.util.find_spec("virtualenv"):
        return True
    return False
def task(python_callable: Callable | None = None, multiple_outputs: bool | None = None, **kwargs):