Time Puzzle



I am puzzled by the date stamps here. How is this possible?

Last unsuccessful login: Thu Feb 1 20:58:34 2007 on ssh from 221.208.160.11
Last login: Thu Feb 1 21:32:06 2007 on ssh from karl-jones
[snip]
F50:/ # date
Thu Feb 1 15:32:40 CST 2007