### 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>
#
#
#
"""Jinja2 template rendering context helper."""
from __future__ import annotations
import contextlib
import copy
import functools
import warnings
from typing import (
    TYPE_CHECKING,
    Any,
    Container,
    ItemsView,
    Iterator,
    KeysView,
    Mapping,
    MutableMapping,
    SupportsIndex,
    ValuesView,
)
import lazy_object_proxy
from airflow.exceptions import RemovedInAirflow3Warning
from airflow.utils.types import NOTSET
if TYPE_CHECKING:
    from airflow.models.baseoperator import BaseOperator
KNOWN_CONTEXT_KEYS = {
    "conf",