It's Only PST Sometimes.
Some of you already know this, but surprising portion of you need a reminder. To whit: it's only P.S.T. sometimes. (The same for E.S.T, C.S.T and M.S.T of course.) P.S.T. stands for Pacific Standard Time, and it is only in effect from Nov through Apr.
It's P.D.T. (Pacific Daylight Time) the rest of the year - such as now. Therefore, you can't go throwing around P.S.T. all year. If you must specify a time zone, play it safe and simply say Pacific Time.