How to do job once at a specific date and time?

Hello!

I need a Python script that executes some task once in a specific date and time? Can I do it using Schedule? In the documentation I've found such a code:

```Python
schedule.every().day.at('22:30').do(job_that_executes_once)
```
It works, but I need something like this:
```Python
schedule.every().day.at('2022-04-03 22:30').do(job_that_executes_once)
```
But this code returns an error. Can I do it in some way?

Thanks!

Start by reviewing the Schedule documentation and the `schedule.every().day.at()` entry point shown in the issue. Determine whether a one-off job at a specific date and time is supported; done means documenting the supported approach or clearly defining the requested behavior if a code change is needed.

Written by the indexing model from the issue text.