[CentOS] we want to delete all files in a folder except the files with the most recent date

Hi, 

We want to delete all files in a folder except the files with the most recent date 
example 

ls -l 
jun 3 10:45 file1 
jun 3 12:20 file2 
jun 2 10:20 file3 
jun 2 05:00 file4 
jun 1 12:00 file5 
jun 1 10:00 file6 

jun2 en jun1 must be deleted 

regards,