gistfile1.txt

from datetime import datetime
import pytz


def dump(dt):
    print '1. strftime   : %s' % dt.strftime('%Y-%m-%d %H:%M')
    print '2. str        : %s' % dt
    print '3. as utc     : %s' % dt.astimezone(pytz.utc)
    print '4. 3 as local : %s' % dt.astimezone(pytz.utc).astimezone(ny)
    print ''

ny = pytz.timezone('America/New_York')

print '=== create datetime with tzinfo ==='
dump(datetime(2013, 4, 10, 8, 0, tzinfo=ny))

print '=== localize naive datetime ==='
dump(ny.localize(datetime(2013, 4, 10, 8, 0)))

print '=== nomalize tzinfo ==='
dump(ny.normalize(datetime(2013, 4, 10, 8, 0, tzinfo=ny)))

=== create datetime with tzinfo ===
1. strftime   : 2013-04-10 08:00
2. str        : 2013-04-10 08:00:00-05:00
3. as utc     : 2013-04-10 13:00:00+00:00
4. 3 as local : 2013-04-10 09:00:00-04:00

=== localize naive datetime ===
1. strftime   : 2013-04-10 08:00
2. str        : 2013-04-10 08:00:00-04:00
3. as utc     : 2013-04-10 12:00:00+00:00
4. 3 as local : 2013-04-10 08:00:00-04:00

=== nomalize tzinfo ===
1. strftime   : 2013-04-10 09:00
2. str        : 2013-04-10 09:00:00-04:00
3. as utc     : 2013-04-10 13:00:00+00:00
4. 3 as local : 2013-04-10 09:00:00-04:00