Could you please give a hand to resolve this problem:-

I want to GREEN between 10 minutes prior to start and 1 minute after start.But it seems can't set up this requir at Rule trigger times of Guardian.Rule trigger times of Guardian only triggered at a specific time 10 minutes prior to start other than from 10 minutes prior to start to 1 minute after start.
I want to trigger the GREEN with condition within 11 munites.Anyone has a good idea ?
Thanks for any helps.