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")

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