780 files in /usr/share/zoneinfo/

[mike . junk . 46]

Of the 780 files in /usr/share/zoneinfo/ America/Chicago and CST6CDT are the 
only two that might apply to me. Are the rest of any use to me at all? If so 
how? And, yes, I understand that they need to be supplied for every zone in the 
world initially but am curious if there is any use for them after one's own 
time zone is set.
Thanks,
Mike