python中time模块和datetime模块

time模块和datetime模块

时间分为三种模式(time 模块)

1. 时间戳   （time.time())

2. 格式化字符串 （time.strftime(%Y-%m-%d %H:%M:%S %p))

3. 结构化的时间对象  (time.localtime()  time.gmtime())

   import time
   print(time.localtime())
   print(time.localtime().tm_hour)
   print(time.localtime().tm_wday)
   print(time.localtime().tm_yday)
   print(time.gmtime())
   #时间转换
   #时间戳---->struct_time------->格式化的字符串
   import time
   struct_time=time.localtime(123123)
   print(struct_time)
   ​
   print(time.strftime('%Y-%m-%d',struct_time))
   ​
   #格式化的字符串---->struct_time------->时间戳
   struct_time=time.strptime('2017-03-11','%Y-%m-%d')
   print(struct_time)
   ​
   print(time.mktime(struct_time))
   ​
   ​
   import datetime   #datetime模块
   print(datetime.datetime.now())
   ​
   print(datetime.datetime.fromtimestamp(1231231))
   ​
   print(datetime.datetime.now() + datetime.timedelta(days=3))
   print(datetime.datetime.now() - datetime.timedelta(days=3))
   print(datetime.datetime.now() + datetime.timedelta(days=-3))
   print(datetime.datetime.now() + datetime.timedelta(days=3,hours=3))