datetime timestamp使用

#coding=utf-8
import time
import datetimedef yes_time():
#获取当前时间
now_time = datetime.datetime.now()
#当前时间减去一天 获得昨天当前时间
yes_time = now_time + datetime.timedelta(days=-1)
#格式化输出
yes_time_str = yes_time.strftime('%Y-%m-%d %H:%M:%S')
print yes_time_str # 2017-11-01 22:56:02def dif_time():
#计算两个时间之间差值
now_time = datetime.datetime.now()
now_time = now_time.strftime('%Y-%m-%d %H:%M:%S')
d1 = datetime.datetime.strptime('2017-10-16 19:21:22', '%Y-%m-%d %H:%M:%S')
d2 = datetime.datetime.strptime(now_time, '%Y-%m-%d %H:%M:%S')
#间隔天数
day = (d2 - d1).days
#间隔秒数
second = (d2 - d1).seconds
print day #17
print second #13475 注意这样计算出的秒数只有小时之后的计算额 也就是不包含天之间差数def unix_time():
#将python的datetime转换为unix时间戳
dtime = datetime.datetime.now()
un_time = time.mktime(dtime.timetuple())
print un_time #1509636609.0
#将unix时间戳转换为python 的datetime
unix_ts = 1509636585.0
times = datetime.datetime.fromtimestamp(unix_ts)
print times #2017-11-02 23:29:45