[CentOS] what updates /etc/localtime?

> On 13 Apr 2015, at 20:13, "Les Mikesell" <lesmikesell at gmail.com> wrote:
> 
> I see in CentOS 7 that /etc/localtime is a symlink (which seems
> sensible...) but in earlier versions it is a copy of some file from
> under /usr/share/zoneinfo.
> rpm -q --scripts tzdata
> does not show any postinstall script, so in the non-symlink versions,
> how does the copied /etc/localtime file get updated with new zone
> data?

I believe it is by glibc-common on CentOS 6 - it may be the same on CentOS 7

James Pearson