$ 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