Finding RPMs from a particular day

I ran into problem where a vendor wanted to know all of the patches that installed via RPM to their appliance for a given day.
RPM stores that info but I didn't know how to access it easily.  There is probably an easier way to do this, but I put the following command line together and it seems to work:

rpm -qai | egrep -3 "Mon 20 Sep|Tue 21 Sep" | egrep "^Name|^Install Date" | sed -e 's/Relocations:.*$//' | sed -e 's/Build Host.*$//' | sed -e 's/   */ /g' | perl -e 'while (defined($line1=)) { $line2 = ; chomp ($line1); chomp ($line2); print "$line1\t\t$line2\n";}' | sort


Fun times.

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