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Parse an :RFC:`3339`-formatted timestamp and return a
`datetime.datetime`.
If the timestamp is presented in UTC, then the `tzinfo` parameter of the
returned `datetime` will be set to `pytz.utc`.
>>> parse('2009-01-01T10:01:02Z')
datetime.datetime(2009, 1, 1, 10, 1, 2, tzinfo=<UTC>)
Otherwise, a `tzinfo` instance is created with the appropriate offset, and
the `tzinfo` parameter of the returned `datetime` is set to that value.
>>> parse('2009-01-01T14:01:02-04:00')
datetime.datetime(2009, 1, 1, 14, 1, 2, tzinfo=<UTC-04:00>)
However, if `parse()` is called with `utc=True`, then the returned
`datetime` will be normalized to UTC (and its tzinfo parameter set to
`pytz.utc`), regardless of the input timezone.
>>> parse('2009-01-01T06:01:02-04:00', utc=True)
datetime.datetime(2009, 1, 1, 10, 1, 2, tzinfo=<UTC>)
The input is strictly required to conform to :RFC:`3339`, and appropriate
exceptions are thrown for invalid input.
>>> parse('2009-01-01T06:01:02')
Traceback (most recent call last):
...
ValueError: timestamp does not conform to RFC 3339
>>> parse('2009-01-01T25:01:02Z')
Traceback (most recent call last):
...
ValueError: hour must be in 0..23
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