Merging several text files into a text with order

Question

Hi,

 

I have a folder which it is has a path like:C:\\Users\\e.u.\\Desktop\\projee1\\ 

in this folder projee1 it has several text files for example;

20.07.2015-1.txt

20.07.2015-2.txt

20.07.2015-3.txt

21.07.2015-1.txt

22.07-2015-1.txt

i need to merge them with order(first one will be the one with oldest date,in this case 20.07.2015-1)
in a folder which it has path like:  C:\\Users\\e.u.\\Desktop\\projee1\\Weekly

how can i do this?