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-dateutilfrom dateutil import tzfrom dateutil.tz import tzlocalfrom datetime import datetime # get local time zone nameprint datetime.now(tzlocal()).tzname() # UTC Zonefrom_zone = tz.gettz('UTC')# China Zoneto_zone = tz.gettz('CST') utc = datetime.utcnow() # Tell the datetime object that it's in UTC time zoneutc = utc.replace(tzinfo=from_zone) # Convert time zonelocal = utc.astimezone(to_zone)print datetime.strftime(local, "%Y-%m-%d %H:%M:%S")