Changing PO time to :30 increments

I read the prior exchange titled "Non o'clock payout times," but I haven't been able to find a definite answer as to whether my time zone (United States, Pacific Standard Time) can change to :30 PO increments--I only have the xx:00 options (as opposed to :00 and :30 options). Does anyone know whether there are only certain parts of the world that have access to the :30 options or if there is a change that would allow anyone to access the :30 options?

Thanks.