1970年构造ObjectId()时间戳为负

import time
import datetime
from bson.objectid import ObjectId
from collections import Iterator


class MyIter(Iterator):
    def __next__(self):
        return ObjectId()

published_at = datetime.datetime.now()
print(published_at)
print(published_at.timetuple())
print(time.mktime(published_at.timetuple()))
print(int(time.mktime(published_at.timetuple())))
# 2019-04-04 17:36:45.322429
# time.struct_time(tm_year=2019, tm_mon=4, tm_mday=4, tm_hour=17, tm_min=36, tm_sec=45, tm_wday=3, tm_yday=94, tm_isdst=-1)
# 1554370644.0
# 1554370671

oid = MyIter().__next__()
print(str(oid))
print(str(oid)[8:])
# <__main__.MyIter object at 0x10319e358>
# _.MyIter object at 0x10319e358>

print('{:02x}'.format(int(time.mktime(published_at.timetuple()))))
# 5ca5d16f


origin_time = "1970-01-01 00:00:00"
origin_time = datetime.datetime.strptime(origin_time, "%Y-%m-%d %H:%M:%S")
print(origin_time)
print(type(origin_time))

# published_at=创建时间

published_at = datetime.datetime.now()

published_at = "1970-01-01 00:00:00"
published_at = datetime.datetime.strptime(published_at, "%Y-%m-%d %H:%M:%S")


if published_at > origin_time:
    print("yes")
    _id = ObjectId('{:02x}'.format(int(time.mktime(published_at.timetuple()))) + str(oid)[8:])
    print('_id01: ', _id)
else:
    published_at = datetime.datetime.now()
    _id = ObjectId('{:02x}'.format(int(time.mktime(published_at.timetuple()))) + str(oid)[8:])
    print('_id02: ', _id)

# Traceback (most recent call last):
#   File "/Users/Alex/Desktop/toc_backend/aaa_xwk/create_objectid.py", line 36, in <module>
#     _id = ObjectId('{:02x}'.format(int(time.mktime(published_at.timetuple()))) + str(oid)[8:])
#   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/bson/objectid.py", line 125, in __init__
#     self.__validate(oid)
#   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/bson/objectid.py", line 221, in __validate
#     _raise_invalid_id(oid)
#   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/bson/objectid.py", line 67, in _raise_invalid_id
#     " or a 24-character hex string" % oid)
# bson.errors.InvalidId: '-7080f71ec31bb7b87df9' is not a valid ObjectId, it must be a 12-byte input or a 24-character hex string