eastern = pytz.timezone('US/Eastern')
fmt = '%Y-%m-%d %H:%M:%S %Z%z'
text = """10/1/2010   0:0:0
10/1/2010   0:6:0
10/1/2010   23:54:0
10/3/2010   0:0:0
3/13/2011   1:55:0
3/13/2011   3:00:0
"""
for datestring in text.splitlines():
    date = dt.datetime.strptime(datestring, '%m/%d/%Y %H:%M:%S')
How to convert EST/EDT to GMT?