Benjamin Clapp (born October 13, 1977) is an American musician from Boise, Idaho. He has performed, composed, and recorded music with numerous artists, most notably Jim Breuer, Jesse Blaze Snider and Baptized By Fire, Tom Marshall and Amfibian, Kronos Quartet, Erik Sanko and Skeleton Key, Dee Snider (Twisted Sister), David Peel (The Lower East Side), and White Trash.
Benjamin Clapp was a year old on October 13 in 1977
The context says that Benjamin Clapp was born on October 13 1977 so he was not already a year old on that date. The system likely did not understand the meaning of that date.