Probably many different ways.
I don't have that distribution, but Fedora has a list of all currently installed packages in /var/log called "rpmpkgs", and a "yum.log" in the same directory giving specific dates of updated packages. You can also read the rpm man page to learn how to use the rpm querry commands. It's hard to give the perfect answer when you don't specify what update you're talking about, like "kernel", "all updated packages", etc.
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