1、字串轉換為datetime.datetime：

print(datetime.datetime.strptime("2020-07-09 18:21:17", "%Y-%m-%d %H:%M:%S"))

輸出：2020-07-09 18:21:17

2、tuple、list轉換為datetime.datetime：

datetime_list = [2020, 7, 10, 9, 40, 47]
datetime_tuple = (2020, 7, 10, 9, 40, 47)

print(datetime.datetime(*datetime_list))
print(datetime.datetime(*datetime_tuple))

輸出：

2020-07-10 09:40:47
2020-07-10 09:40:47

3、日期加減

print(datetime.datetime.now())
print(datetime.datetime.now() + datetime.timedelta(hours=1))
print(datetime.datetime.now() + datetime.timedelta(days=1))
print(datetime.datetime.now() + datetime.timedelta(weeks=1))

輸出：

2020-07-14 11:34:47.671556

2020-07-14 12:34:47.671556

2020-07-15 11:34:47.671556

2020-07-21 11:34:47.671556

4、修改時間為指定時間（查詢是從00:00:00開始查詢）

print((datetime.datetime.now() + datetime.timedelta(days=1)).strftime("%Y-%m-%d 00:00:00"))

輸出：

2020-07-15 00:00:00

5、10 && 13位時間戳：

print(int(datetime.datetime.now().timestamp()))
print(int(datetime.datetime.now().timestamp())*1000)
print
 
(int(datetime.datetime(2020, 7, 10, 9, 40, 47).timestamp()))
print(int(datetime.datetime(2020, 7, 10, 9, 40, 47).timestamp())*1000)

輸出：

1594698366

1594698366000

1594345247

1594345247000