import pytz
local_tz = pytz.timezone('Asia/Tokyo')
start_date = local_tz.localize(datetime(2012, 9, 27), is_dst=None)
now_utc = datetime.utcnow().replace(tzinfo=pytz.utc)
print(start_date > now_utc)
pytz and astimezone() cannot be applied to a naive datetime