Process Files in a folder based on their creation time suffixed

Hi, 

I want to process files based on the creation time prefixed to them. 

for ex: 

File1_20161201.txt

File2_20161202.txt

File3_20161203.txt

File3_20161217.txt

File3_20161218.txt

Need to process the files in the above order. Please help. 

Thanks,

Vikram