OverflowError: date value out of range

• asyncpg version: 0.18.3
• PostgreSQL version: 10.7
• Do you use a PostgreSQL SaaS? If so, which? Can you reproduce
  the issue with a local PostgreSQL install?: Yes
• Python version: 3.7
• Platform: Mac OS
• Do you use pgbouncer?: No
• Did you install asyncpg with pip?: Yes
• If you built asyncpg locally, which version of Cython did you use?:
• Can the issue be reproduced under both asyncio and
  uvloop?:

asyncpg is failing to parse timestamp

code:

import asyncio
import asyncpg

async def run():
    conn = await asyncpg.connect(user='secure', password='secure',
                                 database='secure',
                                 host='secure.com', port=15432, timeout=600)

    values = await conn.fetch('''SELECT  _ts FROM Events''')
    print(values)
    await conn.close()


loop = asyncio.get_event_loop()
loop.run_until_complete(run())

Timestamp format: 2019-01-01T08:42:25.921Z

Traceback (most recent call last):
  File "/scratch_65.py", line 21, in <module>
    loop.run_until_complete(run())
  File "/usr/local/Cellar/python/3.7.2/Frameworks/Python.framework/Versions/3.7/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
    return future.result()
  File "/scratch_65.py", line 15, in run
    values = await conn.fetch('''SELECT  _ts FROM Events''')
  File "/lib/python3.7/site-packages/asyncpg/connection.py", line 421, in fetch
    return await self._execute(query, args, 0, timeout)
  File "/lib/python3.7/site-packages/asyncpg/connection.py", line 1414, in _execute
    query, args, limit, timeout, return_status=return_status)
  File "/lib/python3.7/site-packages/asyncpg/connection.py", line 1422, in __execute
    return await self._do_execute(query, executor, timeout)
  File "/lib/python3.7/site-packages/asyncpg/connection.py", line 1444, in _do_execute
    result = await executor(stmt, None)
  File "asyncpg/protocol/protocol.pyx", line 196, in bind_execute
  File "asyncpg/protocol/coreproto.pyx", line 65, in asyncpg.protocol.protocol.CoreProtocol._read_server_messages
  File "asyncpg/protocol/coreproto.pyx", line 202, in asyncpg.protocol.protocol.CoreProtocol._process__bind_execute
  File "asyncpg/protocol/coreproto.pyx", line 498, in asyncpg.protocol.protocol.CoreProtocol._parse_data_msgs
  File "asyncpg/protocol/protocol.pyx", line 754, in asyncpg.protocol.protocol.BaseProtocol._decode_row
  File "asyncpg/protocol/prepared_stmt.pyx", line 282, in asyncpg.protocol.protocol.PreparedStatementState._decode_row
  File "asyncpg/protocol/codecs/base.pyx", line 288, in asyncpg.protocol.protocol.Codec.decode
  File "asyncpg/protocol/codecs/base.pyx", line 195, in asyncpg.protocol.protocol.Codec.decode_scalar
  File "asyncpg/pgproto/./codecs/datetime.pyx", line 252, in asyncpg.pgproto.pgproto.timestamptz_decode
OverflowError: date value out of range

Start with asyncpg/pgproto/./codecs/datetime.pyx at timestamptz_decode, then reproduce the failure using the provided Python query against PostgreSQL. Trace how the reported timestamp is decoded and add coverage for this case if the repository has a relevant test location. Done means the query returns the timestamp without OverflowError.