Anaconda should prompt to set the system date and time -- right before the timezone prompt, probably -- before installation begins, so that the installed files have an accuredate date/time stamp on them.
this has been added to our feature request list ... thanks for your report!
*** Bug 5883 has been marked as a duplicate of this bug. ***
Related to bug 17887?
*** Bug 63787 has been marked as a duplicate of this bug. ***