python3 datetime和time获取当前日期和时间

 import datetime
 import time

 # 获取当前时间, 其中中包含了year, month, hour, 需要import datetime
 today = datetime.date.today()
 print(today)
 print(today.year)
 print(today.month)
 print(today.day)
 '''
 >>>2017-01-01
 >>>2017
 >>>1
 >>>1
 '''

 # 获得明天, 其他依次类推
 tomorrow = today + datetime.timedelta(days=1)
 print(tomorrow)
 '''
 >>>2017-01-02
 '''

 # 时间相减，相加同理
 now = datetime.timedelta(days=0, hours=0, minutes=3, seconds=50);
 pre = datetime.timedelta(days=0, hours=0, minutes=1, seconds=10);

 duration_sec = (now - pre).seconds
 duration_day = (now - pre).days
 print(type(duration_sec))
 print(type(now - pre))
 print(duration_sec)
 print(duration_day)
 '''
 >>><class 'int'>
 >>><class 'datetime.timedelta'>
 >>>160
 >>>0
 '''

 # 使用time.strftime(format, p_tuple)获取当前时间，需要import time
 now = time.strftime("%H:%M:%S")
 print(now)
 '''
 >>>23:49:34
 '''

 # 使用datetime.now()
 now = datetime.datetime.now()
 print(now)
 print(now.year)
 print(now.month)
 print(now.day)
 print(now.hour)
 print(now.minute)
 print(now.second)
 print(now.microsecond)
 '''
 >>>2017-01-01 23:49:34.789292
 >>>2017
 >>>1
 >>>1
 >>>23
 >>>49
 >>>34
 >>>789292
 '''