[Python知识库]python时间模块： 时间处理方法，遇到的问题。

获取时间的方法

• 获取昨日时间：

datetime.date.today() + datetime.timedelta(-1)  
(datetime.datetime.now() + relativedelta(days = -1)).strftime("%d")

• 多加（减）一分钟

(datetime.datetime.now()+datetime.timedelta(minutes=1)).strftime("%Y-%m-%d %H:%M:%S")
2022-03-23 10:45:21
(datetime.datetime.now()-datetime.timedelta(minutes=1)).strftime("%Y-%m-%d %H:%M:%S")
2022-03-23 10:43:21

• 多加（减）一小时

(datetime.datetime.now()+datetime.timedelta(hours=1)).strftime("%Y-%m-%d %H:%M:%S")
2022-03-24 10:42:06
(datetime.datetime.now()-datetime.timedelta(hours=1)).strftime("%Y-%m-%d %H:%M:%S")
2022-03-23 06:43:21

• 多加（减）一天

(datetime.datetime.now()+datetime.timedelta(days=1)).strftime("%Y-%m-%d %H:%M:%S")
2022-03-24 10:43:58
(datetime.datetime.now()-datetime.timedelta(days=1)).strftime("%Y-%m-%d %H:%M:%S")
2022-03-22 10:43:58

时间戳的转时间

• python时间戳转时间（10位）

timeStamp  = 1648027635
timeArray = time.localtime(timeStamp)#秒数
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)

结果：
2022-03-23 17:27:15

• java时间戳转时间（13位）

timeStamp = 1638441354453
timeStamp_py = int(timeStamp/1000)
timeArray = time.localtime(timeStamp_py)#秒数
otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)

结果：
2021-12-02 18:35:54

数据补全时间

otherStyleTime  ='2022-01-14'
uploadTime = datetime.strptime(otherStyleTime, "%Y-%m-%d")

otherStyleTime1  ='20220114'
uploadTime1 = datetime.strptime(otherStyleTime1, '%Y%m%d')

otherStyleTime2  ='2022年01月14日'
uploadTime2 = datetime.strptime(otherStyleTime2, '%Y年%m月%d日')

结果：
2022-01-14 00:00:00
2022-01-14 00:00:00
2022-01-14 00:00:00