python时间戳与日期格式互转

def stamp_to_datetime(stamp,strformat="%Y-%m-%d %H:%M:%S"):

"""时间戳转日期格式
"""
import datetime
import time

stamp = int(stamp)
strf = time.strftime(strformat,time.localtime(stamp))
dt_format = datetime.datetime.strptime(strf,strformat)
return dt_format

def stamp_to_time(stamp,strformat="%Y-%m-%d %H:%M:%S"):
stamp = int(stamp)
ltime = time.localtime(stamp)
timeStr = time.strftime(strformat, ltime)
return timeStr

def datetime_toTimestamp(date_time):
return int(time.mktime(date_time.timetuple()))

如：print datetime_toTimestamp(datetime.datetime.now())

def string_toDatetime(string,strformat='%Y-%m-%d %H:%M:%S'):
return datetime.datetime.strptime(string, strformat)

#如：
print string_toDatetime("2016-10 10:10:10")

def string_toTimestamp(strTime,strformat='%Y-%m-%d %H:%M:%S'):
date_format = datetime.datetime.strptime(strTime, strformat)
return int(time.mktime(date_format.timetuple()))

string_toTimestamp('2016-10 10:10:10')

def get_last_time(date,n_day=0,n_hour=0,n_min=0,n_sec=0,fm="%Y-%m-%d %H:%M:%S"):
"""
获取上一个/下一个日期、小时、分、秒
正数为上一个，负数为下一个
返回字符串日期格式
"""
now_date = datetime.datetime.strptime(date,fm)
last_date = now_date - datetime.timedelta(days=n_day,hours=n_hour,minutes=n_min,seconds=n_sec)
last_date_str = last_date.strftime(fm)
return last_date_str
print get_last_time('2017-03-06 02:00:01')