Unless there's a glitch, which is often possible, it should be good until the next expiration cycle, which is reported as the last Sunday in February - 2019 in this case.

Or some new process and date from an integrated MR/SPG program, which could change everything.

I called to inquire if my PP status had been renewed. She said yes, through Jan 31, 2019. So I guess the date has changed, from end Feb to end Jan, like many (most? all?) of the airlines have done.

I found out my issue. Somehow my SPG Gold membership fell off my account from my Amex Platinum in turn it fell off my Marriott account. I relinked my SPG. Hopefully my Marriott refreshes soon.