How to parse a string as UTC in Python

utc.py

import datetime

class UTC(datetime.tzinfo):
	ZERO = datetime.timedelta(0)
	def utcoffset(self, dt):
		return self.ZERO
	def tzname(self, dt):
		return 'UTC'
	def dst(self, dt):
		return self.ZERO

# s = {'year':'2014', 'month':'05', 'day':'01', 'time':'005359'}
def make_datetime(s):
	dt = datetime.datetime.strptime('%(year)s-%(month)s-%(day)s %(time)s' % s, '%Y-%m-%d %H%M%S')
	dt = dt.replace(tzinfo=UTC())
	print dt.strftime('%z')