$ ls -l --full-time make.sh
-rw-------+ 1 AndreasB mkpasswd 5772 2015-02-12 11:35:54.323703100 +0100 make.sh

$ perl -MPOSIX=strftime -le 'print strftime("%Y%m%d", localtime((stat shift)[9]))' make.sh
20150212

$ stat make.sh
  File: 'make.sh'
  Size: 5772            Blocks: 8          IO Block: 65536  regular file
Device: 7a51ec0fh/2052189199d   Inode: 12384898975415113  Links: 1
Access: (0600/-rw-------)  Uid: (  400/AndreasB)   Gid: (  401/mkpasswd)
Access: 2015-02-12 11:35:54.323703100 +0100
Modify: 2015-02-12 11:35:54.323703100 +0100
Change: 2015-02-13 14:48:31.352376000 +0100
 Birth: 2014-11-26 17:16:45.173977800 +0100

$ stat -c %y make.sh
2015-02-12 11:35:54.323703100 +0100

$ stat -c %x make.sh
2015-02-12 11:35:54.323703100 +0100

file date format
HowTo Format Date For Display or Use In a Shell Script