python（6）时间戳和北京时间互转，输出当前的时间和推到七天前的日期

项目发展的需要：（包含时间函数）time datetime

时间戳和北京时间互转

 import time
 import datetime
 s = '2015-04-17 11:25:30'
 d = datetime.datetime.strptime(s,"%Y-%m-%d %H:%M:%S")
 print int(time.mktime(d.timetuple()))

运行结果：1429241130

需要当前的日期，并显示出时间轴，然后推出七天前的具体日期

 #! /usr/bin/env python
 # -*- coding=utf-8 -*-
 import re
 import time
 from datetime import datetime
 now = datetime.now()
 list = [0,31,28,31,30,31,30,31,31,30,31,30,31]
 def judge(year):#判断是否是闰年
     if year % 100 == 0 and year % 400 == 0:
          return 1
     elif year % 100 != 0 and year % 4 == 0:
          return 1
     return 0

 def GetNowTime():
     #当前的时间
     print "Now Time:"
     print time.time()
     print time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
     # 输出当前的：年月日 承接上面的 now = datetime.now()
     # y =  now.year
     # m = now.month
     # d = now.day
     #输入年月日：
     print "input:"
     y = int (raw_input())
     m = int (raw_input())
     d = int (raw_input())
     # print time.time()
     # 输出年月日+具体的时间
     # y =  now.year
     # m = now.month
     # d = now.day
     ymd = judge(y)
     print "Input Time："
     print str(y)+"-"+str(m)+"-"+str(d)
     #如果是闰年，则二月份 要加一
     list[2] = list[2] + ymd
     #时间倒退7天
     if(d>7):
         d = d-7
     else:
         #if it not is Janurary
         if m!=1:
             m = m-1
             d = list[m]+d-7
         #if it is Janurary
         else:
             y = y -1    #年份减去1
             m = 12      #月份到12月
             d = d+list[12]-7
     #恢复二月的原始天数
     print "eryue: " +str(list [2])
     list[2] = list[2] - ymd
     #输出七天七的日期
     print 'Seven days ago:'
     print str(y)+"-"+str(m)+"-"+str(d)
 if __name__ == "__main__":
     GetNowTime()

代码测试：

D:\Python27\python.exe D:/py/Bfun/donghua/test.py
Now Time:
1456717147.79
2016-02-29 11:39:07

input:
2015
03
07
Input Time：
2015-3-7
eryue: 28
Seven days ago:
2015-2-28

input:
2016
03
07
Input Time：
2016-3-7
eryue: 29
Seven days ago:
2016-2-29

input:
2016
01
07
Input Time：
2016-1-7
eryue: 29
Seven days ago:
2015-12-31