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python datetime模塊用法

too pre ace time cno 信息 hour 翻譯 replace

python datetime模塊用法

1. 創建naive(無時區信息)的datetime對象

import datetime  
 
dt_utc = datetime.datetime.utcnow()

dt_utc # datetime.datetime(2019, 2, 1, 10, 53, 34, 145034)

dt_utc.tzinfo # None 

dt_local = datetime.datetime.now()

dt_local.tzinfo # None 

# tzinfo為None的datetime對象is naive(不知道怎麽翻譯好。。。)

# tzinfo為tzinfo對象的None的datetime對象is aware。

# 只有都為naive或者都為aware才可以相互比較

2. 創建的aware(有時區信息)的datetime對象

import datetime  
 
dt_utc = datetime.datetime.utcnow()

dt_utc_aware = dt.replace(tzinfo=datetime.timezone.utc)

dt_utc_aware.tzinfo # datetime.timezone.utc

dt_local = datetime.datetime.now()

dt_local_aware = dt_local.replace(tzinfo=datetime.tzinfo(datetime.timedelta(hours=8)))

3. datetime對象的時區轉換

import datetime  
 
dt_utc = datetime.datetime.utcnow()

dt_utc_aware = dt.replace(tzinfo=datetime.timezone.utc)

dt_utc_aware.tzinfo # datetime.timezone.utc

dt_local_aware = dt_utc_aware.astimezone(datetime.timezone(datetime.timedelta(hours=8))) # 轉為北京時間

4. datetime對象和時間戳互轉

import datetime  
 
import time

stamp = time.time() # 獲取時間戳

dt_utc = datetime.datetime.utcfromtimestamp(stamp) # 轉為datetime

# datetime.datetime(2019, 2, 1, 12, 52, 59, 268168)

dt_local = datetime.datetime.fromtimestamp(stamp)

# datetime.datetime(2019, 2, 1, 20, 52, 59, 268168)

stp = dt_utc.timestamp() # 轉為時間戳,時間戳唯一,不因時區變化

4. datetime對象和date對象互轉

import datetime  

d_local = datetime.date.today() # 獲取date

dt_utc = datetime.datetime.fromordinal(d_local.toordinal()) # 轉為datetime

# datetime.datetime(2019, 2, 1, 0, 0)

d_ = dt_utc.date() # 轉為date

# datetime.date(2019, 2, 1)

python datetime模塊用法