python获取指定时间差的时间

    '''
    Created on 2018年02月3日
    '''
    import time
    import sys
    reload(sys)
    def get_day_of_day(UTC=False, days=0, hours=0, miutes=0, seconds=0):
            '''''
            if days>=0,date is larger than today
            if days<0,date is less than today
            date format = "YYYY-MM-DD"
            '''
            now = time.time()
            timeNew = now  + days*24*60*60 + hours*60*60 + miutes*60 + seconds
            if UTC :
                timeNew = timeNew + time.timezone
            t = time.localtime(timeNew)
            return time.strftime('%Y-%m-%d %H:%M:%S', t)
    #使用UTC时间 两小时前           
    t = get_day_of_day(True,0,-2)
    print t
    #当地时间 三天前
    t = get_day_of_day(False,-3)
    print t
    #当地时间  三天后
    t = get_day_of_day(False,3)
    print t</span