#1.将字符串的时间转换为时间戳方法:

a = "2013-10-10 23:40:00"

#将其转换为时间数组

import time

timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S")

# 转换为时间戳:

timeStamp = int(time.mktime(timeArray))

timeStamp == 1381419600
#一行代码的写法是
timeStamp = int(time.mktime(time.strptime(a, "%Y-%m-%d %H:%M:%S")))

# 字符串格式更改如a = "2013-10-10 23:40:00", 想改为a = "2013/10/10 23:40:00"

# 方法:先转换为时间数组, 然后转换为其他格式

timeArray = time.strptime(a, "%Y-%m-%d %H:%M:%S")

otherStyleTime = time.strftime("%Y/%m/%d %H:%M:%S", timeArray)

# 3.时间戳转换为指定格式日期:

# 方法一:利用localtime()转换为时间数组, 然后格式化为需要的格式, 如

timeStamp = 1381419600

timeArray = time.localtime(timeStamp)

otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)

# otherStyletime == "2013-10-10 23:40:00"
#一行代码的写法

otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S",time.localtime(timeStamp))

# 方法二:

import datetime

timeStamp = 1381419600

dateArray = datetime.datetime.utcfromtimestamp(timeStamp)

otherStyleTime = dateArray.strftime("%Y-%m-%d %H:%M:%S")

# otherStyletime == "2013-10-10 23:40:00"

# 4.获取当前时间并转换为指定日期格式

# 方法一:

import time

# 获得当前时间时间戳

now = int(time.time())  #这是时间戳转换为其他日期格式, 如:"%Y-%m-%d %H:%M:%S"

timeArray = time.localtime(timeStamp)

otherStyleTime = time.strftime("%Y-%m-%d %H:%M:%S", timeArray)

# 方法二:

import datetime

# 获得当前时间

now = datetime.datetime.now()  #这是时间数组格式转换为指定的格式:

otherStyleTime = now.strftime("%Y-%m-%d %H:%M:%S")

# 5. 获得三天前的时间

# 方法:

import time

import datetime

# 先获得时间数组格式的日期

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

# 转换为时间戳:

timeStamp = int(time.mktime(threeDayAgo.timetuple()))

# 转换为其他字符串格式:

otherStyleTime = threeDayAgo.strftime("%Y-%m-%d %H:%M:%S")

# 注:timedelta()的参数有:days, hours, seconds, microseconds

# 6.给定时间戳, 计算该时间的几天前时间:

timeStamp = 1381419600

# 先转换为datetime

import datetime

import time

dateArray = datetime.datetime.utcfromtimestamp(timeStamp)

threeDayAgo = dateArray - datetime.timedelta(days=3)