mongdb 时间减去8的问题

#!/usr/bin/env python
# -*- coding:utf-8 -*-
import json
from pymongo import MongoClient
import time
def id2time(object_id):
    timeStamp = int(object_id[:8], 16)
    return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(timeStamp))
import pymongo
import time
import datetime
from bson.objectid import ObjectId


def object_id_from_datetime(from_datetime=None):
    ''' According to the time manually generated an ObjectId '''
    if not from_datetime:
        from_datetime = datetime.datetime.now()
    return ObjectId.from_datetime(generation_time=from_datetime)

def object_id_from_datetime(from_datetime=None):
    ''' According to the time manually generated an ObjectId '''
    if not from_datetime:
        from_datetime = datetime.datetime.now()
    return ObjectId.from_datetime(generation_time=from_datetime)

def range_search(start_timestamp, end_timestamp):
  connection = MongoClient("mongodb://20.5.101.31:27017/")
  with connection:
    db = connection['tlyy']
    table = db['checkf5']
    a = table.find({'_id':{'$lt' : end_timestamp, '$gte' : start_timestamp}})
    print  a
    print type(a)
    print a.limit(1000)
    b=a.limit(1000)
    print type(b)
    for x in b:
        #print str(x['_id'])+'=>'+id2time(str(x['_id']))+'=>'+str(x['f5dict'])
        print str(x['_id']) + '=>' + id2time(str(x['_id']))
if __name__ == '__main__':
  ##时间要减去8
  #start time
  start_time = datetime.datetime(2019, 4, 6, 06, 0, 0)
  start_timestamp = object_id_from_datetime(start_time)
  print start_timestamp
  #end time
  end_time = datetime.datetime(2019, 4, 6, 06, 05, 0)
  end_timestamp = object_id_from_datetime(end_time)
  print end_timestamp
  range_search(start_timestamp, end_timestamp)

  
  
C:Python27python.exe C:/Users/Administrator/PycharmProjects/untitled/F5/rang.py
5ca840600000000000000000
5ca8418c0000000000000000
<pymongo.cursor.Cursor object at 0x02817F70>
<class 'pymongo.cursor.Cursor'>
<pymongo.cursor.Cursor object at 0x02817F70>
<class 'pymongo.cursor.Cursor'>
5ca84087a50a0b6015c7a09a=>2019-04-06 14:00:39
5ca840c1a50a0b6015c7a09d=>2019-04-06 14:01:37
5ca840fea50a0b6015c7a0a0=>2019-04-06 14:02:38
5ca84139a50a0b6015c7a0a3=>2019-04-06 14:03:37
5ca84177a50a0b6015c7a0a6=>2019-04-06 14:04:39

Process finished with exit code 0