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

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

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

def timestamp_utc_now():
 return datetime2timestamp(datetime.datetime.utcnow())

def timestamp_now():
 return datetime2timestamp(datetime.datetime.now())

# 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")