I'm using a bash oneliner to create a cronjob that saves files to a path that depends on the current time, hence I'm using `date`. However, the `date` expression is evaluated when I insert the cronjob, while I want the `date` expression to be evaluated when cron runs the job.

My command is like this:

```
bash -c "(crontab -r; echo \"* * * * * /usr/bin/wget -o /backups/\$(date +\%F_\%R).sql 127.0.0.1:8000/api/export/full\") | crontab -"

```

How can I alter this command to achieve this?