Is there a `MIN` constant for `datetime`?

I need it to represent the expiration date of a resource, and I want to have a `datetime` that represents "always expires" as default value (instead of `None` so I can use the same expiration comparison no matter what). 

So right now I'm using `datetime.datetime(datetime.MINYEAR,1,1,0,0,tzusc())` as my `MIN datetime` but I wonder if there is some other way to represents "the lowest possible time" (even if it's not a `datetime`).
['https://Stackoverflow.com/questions/32862638', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/90580/']
You can try - [`datetime.datetime.min`](https://docs.python.org/2/library/datetime.html#datetime.datetime.min) . According to [documentation](https://docs.python.org/2/library/datetime.html#datetime.datetime.min) -

> 
> **`datetime.min`**
> 
> 
> The earliest representable datetime, datetime(MINYEAR, 1, 1, tzinfo=None).
> 
> 
>
`datetime.datetime.fromtimestamp(0)` it will gives you:

```
datetime.datetime(1970, 1, 1, 1, 0)

```

> 
> Return the local date corresponding to the POSIX timestamp, such as is
>  returned by time.time(). This may raise ValueError, if the timestamp
>  is out of the range of values supported by the platform C localtime()
>  function. It’s common for this to be restricted to years from 1970
>  through 2038. Note that on non-POSIX systems that include leap seconds
>  in their notion of a timestamp, leap seconds are ignored by
>  fromtimestamp().
> 
> 
>