I had some files with a date in it:

some file 23.05.2017.abc
some file 23.05.2007.abc
some file 15.07.2017.abc
some file 02.12.2008.abc

To sort them, use the KEYDEF feature of sort:

find . | sort -k3.8d -k 3.6d -k 3.5d

It it also good to use the --debug option of sort, as it will show you where sort found the key.