get modificaton date of folder

[NiceBoy1234]

Whats is the best method to know if a specific folder has changed his files.
In my case I want to check if pictures in my folder have been changed or not.
(If someone is interest in future plans I want to count afterwards the files in that folder, but that is not important now)
Can anyone help me out, I though of something like getting the current modification date and comparing it somehow with the future one but I do not know if something like that is even possible.

SO basically again I "Just" want to check if a specific folder ( files in that folder) have been changed.

Edited December 21, 2015 by NiceBoy1234

[BrewManNH]

You could try this UDF.