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) -

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> **`datetime.min`**
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> The earliest representable datetime, datetime(MINYEAR, 1, 1, tzinfo=None).
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You could use `time.gmtime(0)` which is the epoch.

[Time Documentation](https://docs.python.org/2/library/time.html)

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> The epoch is the point where the time starts. On January 1st of that year, at 0 hours, the “time since the epoch” is zero. For Unix, the epoch is 1970. To find out what the epoch is, look at gmtime(0).
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