Plistlib fails to load dates before year 1901 and after year 2038 in binary format on platforms with 32-bit time_t. >>> data = plistlib.dumps(datetime.datetime(1901, 1, 1), fmt=plistlib.FMT_BINARY) >>> plistlib.loads(data) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/serhiy/py/cpython/Lib/plistlib.py", line 1006, in loads fp, fmt=fmt, use_builtin_types=use_builtin_types, dict_type=dict_type) File "/home/serhiy/py/cpython/Lib/plistlib.py", line 997, in load return p.parse(fp) File "/home/serhiy/py/cpython/Lib/plistlib.py", line 623, in parse return self._read_object(self._object_offsets[top_object]) File "/home/serhiy/py/cpython/Lib/plistlib.py", line 688, in _read_object return datetime.datetime.utcfromtimestamp(f + (31 * 365 + 8) * 86400) OverflowError: timestamp out of range for platform time_t >>> data = plistlib.dumps(datetime.datetime(2039, 1, 1), fmt=plistlib.FMT_BINARY) >>> plistlib.loads(data) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/serhiy/py/cpython/Lib/plistlib.py", line 1006, in loads fp, fmt=fmt, use_builtin_types=use_builtin_types, dict_type=dict_type) File "/home/serhiy/py/cpython/Lib/plistlib.py", line 997, in load return p.parse(fp) File "/home/serhiy/py/cpython/Lib/plistlib.py", line 623, in parse return self._read_object(self._object_offsets[top_object]) File "/home/serhiy/py/cpython/Lib/plistlib.py", line 688, in _read_object return datetime.datetime.utcfromtimestamp(f + (31 * 365 + 8) * 86400) OverflowError: timestamp out of range for platform time_t Proposed patch fixes this issue.