[issue31212] min date can't be converted to timestamp

[Dave Johansen]

New submission from Dave Johansen:

This worked in Python 3.6.0 and before:
```
from datetime import datetime
d = datetime(1, 1, 1, 0, 0, 0)
d.timestamp()
```

The error output is:
```
ValueError: year 0 is out of range
```

But it used to return `-62135658000.0`.

Appears to be related to https://bugs.python.org/issue29921

----------
messages: 300303
nosy: Dave Johansen
priority: normal
severity: normal
status: open
title: min date can't be converted to timestamp
type: behavior
versions: Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue31212>
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