#!/bin/python
#coding=utf-8
from datetime import datetime
from datetime import timedelta
###################格式化输出 Begin######################
#date>>string
now = datetime.now()
print now.strftime('%Y-%m-%d %H:%M:%S')
#string>>date
str_date='2013-11-02 16:26:23'
d=datetime.strptime(str_date,'%Y-%m-%d %H:%M:%S')
print d
###################格式化输出 End########################
####################日期比较 start#######################
#计算两个日期相差多少天
d1 = datetime.strptime('2013-11-02 16:26:23','%Y-%m-%d %H:%M:%S')
d2 = datetime.strptime('2013-10-02 16:26:23','%Y-%m-%d %H:%M:%S')
diff = d1-d2
print diff.days
#计算N天/N周/N秒后的日期
now = datetime.now()
aDate = timedelta(days=5)#负数表示之前
n_days = now +aDate
print n_days.strftime('%Y-%m-%d %H:%M:%S')
delta1 = timedelta(seconds = 600)
delta2 = timedelta(weeks = 3)
print delta1+now
print delta2+now
####################日期比较 start#######################
