back to the future .. help on history

Mon Jan 29 10:54:37 CET 2007

An unlucky "date" command on the hobbit server has changed the time from 
jan 12 to nov 1 for about 10/15 minutes :(
Now almost all histories look like this:

Mon Jan 29 00:09:59 2007 	green 	10:32:48
Sun Jan 28 23:55:01 2007 	red 	0:14:58
Wed Nov 01 00:00:32 2006 	green 	88 days 23:54:29
Wed Nov 01 00:00:17 2006 	purple 	0:00:15
Fri Jan 12 11:21:29 2007 	green 	none
Fri Jan 12 09:55:20 2007 	red 	1:26:09

is there a way to clean the history removing the wrong "Nov 01" lines?
thank you
--
Gianluca