### Apache Airflow version

2.5.1

### What happened

/calendar page give a problem, here is the capture



![屏幕截图 2023-01-30 093116](https://user-images.githubusercontent.com/19165258/215369479-9fc7de5c-f190-460c-9cf7-9ab27d8ac355.png)


### What you think should happen instead

_No response_

### How to reproduce

_No response_

### Operating System

Ubuntu 22.04.1 LTS

### Versions of Apache Airflow Providers

Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:        22.04
Codename:       jammy

### Deployment

Other

### Deployment details


Distributor ID: Ubuntu
Description:    Ubuntu 22.04.1 LTS
Release:        22.04
Codename:       jammy

### Anything else

_No response_

### Are you willing to submit 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)

"""Duration calculation."""
        end_date = self.get("end_date")
        start_date = self.get("start_date")
        difference = "0s"
        if start_date and end_date:
            difference = td_format(end_date - start_date)
        return difference
    formatters_columns = {
        "execution_date": wwwutils.datetime_f("execution_date"),
        "state": wwwutils.state_f,
        "start_date": wwwutils.datetime_f("start_date"),
        "end_date": wwwutils.datetime_f("end_date"),
        "queued_at": wwwutils.datetime_f("queued_at"),
        "dag_id": wwwutils.dag_link,
        "run_id": wwwutils.dag_run_link,
        "conf": wwwutils.json_f("conf"),
        "duration": duration_f,
    }
    @action("muldelete", "Delete", "Are you sure you want to delete selected records?", single=False)
    @action_has_dag_edit_access
    @action_logging
    def action_muldelete(self, items: list[DagRun]):