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:Python27python.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