MATLAB: Sort elements in a cell , they are all txt file names

cell arrayssort

files ={'200802291600.1.txt';'200803011600.1.txt';'200803021600.1.txt';'200803031600.1.txt';'200803041600.1.txt';'200803051600.1.txt';'200803061600.1.txt';'200803071600.1.txt'}these are the files' names stored in a cell ,sometimes they are in mess ，how to sort them by time ,thanks for doing sth.

• out = sort(files);