The winner has six months from purchase date to claim the MEGA Millions ticket, worth $226,991, before the money is returned to the state, according to California Lottery.
The ticket was purchased at a Shell gas station at 798 El Camino Real in San Bruno.
Officials do not release the specific purchase dates of winning tickets until after the tickets have been claimed, a lottery spokeswoman said.
The date is one of the questions asked to verify that the person claiming the prize is in fact the winner, she said.
The winning ticket matched five numbers -- 15, 22, 23, 48 and 55 -- and was only missing the MEGA number, 31, officials said.