need the last access time for a .gz file

Shell Programming and Scripting
1

i have file named aaaa.
The file aaaa was zipped on one particular time.
Need to know the command to find out when the file "aaaa" was actually zipped.

2

try:

ls -lrt | tr -s " " | cut -d" " -f6-9

or

stat -c "%y" file

or

cd /pathtodirectory/
ls -l | awk '{ printf $9 "-" $6" " $7" " $8"\n" }'