Python中实现对Timestamp和Datetime及UTC时间之间的转换

http://www.jb51.net/article/63654.htm

Python项目中很多时候会需要将时间在Datetime格式和TimeStamp格式之间转化，又或者你需要将UTC时间转化为本地时间，本文总结了这几个时间之间转化的函数，供大家参考。

一、Datetime转化为TimeStamp

def datetime2timestamp(dt, convert_to_utc=False):

''' Converts a datetime object to UNIX timestamp in milliseconds. '''

if isinstance(dt, datetime.datetime):

if convert_to_utc: # 是否转化为UTC时间

dt = dt + datetime.timedelta(hours=-8) # 中国默认时区

timestamp = total_seconds(dt - EPOCH)

return long(timestamp)

return dt

二、TimeStamp转化为Datetime

def timestamp2datetime(timestamp, convert_to_local=False):

''' Converts UNIX timestamp to a datetime object. '''

if isinstance(timestamp, (int, long, float)):

dt = datetime.datetime.utcfromtimestamp(timestamp)

if convert_to_local: # 是否转化为本地时间

dt = dt + datetime.timedelta(hours=8) # 中国默认时区

return dt

return timestamp

三、当前UTC时间的TimeStamp

def timestamp_utc_now():

return datetime2timestamp(datetime.datetime.utcnow())

四、当前本地时间的TimeStamp

def timestamp_now():

return datetime2timestamp(datetime.datetime.now())

五、UTC时间转化为本地时间

# 需要安装python-dateutil

# Ubuntu下：sudo apt-get install python-dateutil

# 或者使用PIP：sudo pip install python-dateutil

from dateutil import tz

from dateutil.tz import tzlocal

from datetime import datetime

# get local time zone name

print datetime.now(tzlocal()).tzname()

# UTC Zone

from_zone = tz.gettz('UTC')

# China Zone

to_zone = tz.gettz('CST')

utc = datetime.utcnow()

# Tell the datetime object that it's in UTC time zone

utc = utc.replace(tzinfo=from_zone)

# Convert time zone

local = utc.astimezone(to_zone)

print datetime.strftime(local, "%Y-%m-%d %H:%M:%S")