年-月-日 时:分:秒.毫秒
%Y-%m-%d %H:%M:%S.%f

# -*- coding:utf-8 -*-

import time
from datetime import datetime
from datetime import date
from datetime import timedelta

# 1、获取当前时间的时间戳
t = time.time()
# <type 'float'>, 1525687472.870682


# 2、获取当前时间元组
t = time.localtime()
# <type 'time.struct_time'>,
# time.struct_time(tm_year=2018, tm_mon=5, tm_mday=7, tm_hour=18, 
#        tm_min=5, tm_sec=47, tm_wday=0, tm_yday=127, tm_isdst=0))
 

# 3、获取当前时间的字符串
# 本地时间
t1 = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
t2 = time.strftime("%Y-%m-%d %H:%M:%S",time.localtime())

# utc时间：就是0时区的区时,比北京时间晚8小时
t3 = datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S")
t4 = time.strftime("%Y-%m-%d %H:%M:%S",time.gmtime())
"""
<type 'str'>, '2018-05-07 18:03:38'
<type 'str'>, '2018-05-07 18:03:38'
<type 'str'>, '2018-05-07 10:03:38'
<type 'str'>, '2018-05-07 10:03:38'
"""


# 4、获取时间对象
# 获取当前日期和时间 datetime
t = datetime.now()
# (<type 'datetime.datetime'>, 
# datetime.datetime(2018, 5, 7, 18, 10, 13, 538265))

# 获取当前日期 date
t1 = datetime.now().date()
# (<type 'datetime.date'>, datetime.date(2018, 5, 7))

# 获取当前时间 time
t2 = datetime.now().time()
# (<type 'datetime.time'>, datetime.time(18, 11, 4, 939271))

t = datetime.now() - timedelta(days=3)

# 1、时间戳与时间元组

# 时间戳 -> 时间元组:
t = time.localtime(1525681106.08)

# 时间元组 -> 时间戳
t = time.mktime(time.localtime())


# 2、时间元组与字符串

# 时间元组 -> 字符串
t = time.strftime("%Y-%m-%d %H:%M:%S",time.localtime())

# 字符串 ->  时间元组
t = time.strptime("2018-01-07 17:26:24","%Y-%m-%d %H:%M:%S")


# 3、时间戳与字符串

# 时间戳 -> 字符串
t = time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(1525681106.08))

t = datetime.fromtimestamp(1525681106.08).strftime("%Y-%m-%d %H:%M:%S")

# 字符串 -> 时间戳：
t = time.mktime(time.strptime("2018-01-07 17:26:24","%Y-%m-%d %H:%M:%S"))


# 4、时间戳与datetime对象

# 时间戳 -> datetime对象
t = datetime.fromtimestamp(1525681106.08)

# UTC
t = datetime.utcfromtimestamp(1525681106.08)  

# datetime对象 -> 时间戳
t = time.mktime(datetime.now().timetuple())
# 不过要注意的是time是从1900开始计算的。而datetime包含1-9999的范围

t = datetime.now().timestamp()

# 5、时间元组与datetime对象

# 时间元组对象 -> datetime对象 
t = datetime.fromtimestamp(time.mktime(time.localtime()))

# datetime对象 -> 时间元组对象
t = datetime.now().timetuple()


# 6、字符串与datetime对象

# str字符串 -> datetime对象 
t = datetime.strptime("2018-01-07 17:26:24", "%Y-%m-%d %H:%M:%S")

# datetime对象 -> str字符串
t = datetime.now().strftime("%Y-%m-%d %H:%M:%S")


# 7、datetime, data, time 对象之间转换

# datetime对象 -> date对象
t1 = datetime.now().date() 

# datetime对象 -> time对象
t2 = datetime.now().time()

# date对象 + time对象 -> datetime对象
t = datetime.combine(t1, t2)
# <type 'datetime.datetime'>


# 8、date对象与时间戳

# 时间戳  ->  date对象
t = date.fromtimestamp(time.time())