from datetime import datetime

from dateutil import tz

# METHOD 1: Hardcode zones:

from_zone = tz.gettz('UTC')

to_zone = tz.gettz('America/New_York')

# METHOD 2: Auto-detect zones:

from_zone = tz.tzutc()

to_zone = tz.tzlocal()

# utc = datetime.utcnow()

utc = datetime.strptime('2011-01-21 02:37:21', '%Y-%m-%d %H:%M:%S')

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

# datetime objects are 'naive' by default

utc = utc.replace(tzinfo=from_zone)

# Convert time zone

central = utc.astimezone(to_zone)