Using pytz
for conversation of time and date into other timezones.
import pytz, datetime, calendar
#import dateutil
d1 = datetime.datetime(2013, 4, 20, 7, 50, tzinfo=pytz.timezone('US/Pacific'))
d2 = datetime.datetime(2013, 4, 20, 9, 40, tzinfo=pytz.timezone('US/Pacific'))
d1Utc = d1.astimezone(pytz.timezone('UTC'))
d1UtcTs = calendar.timegm(d1.utctimetuple())