Need shell script code for to get the most recent file present in ftp server based on both timestamp and date

Hi Experts,

               i had a requirement where i need to pick the file from the ftp server which is installed in the unix server.here i need to pick a file based on date and timestamp . for example the file name convention is Action_20150307_045532_0101.txt and WMAction_20150307_045532_0101.txt i need to pick these two files which is having both based on both the date and timestamp.i.e most recent file and it should be processed by the file adater. here i am using file to file with ftp protocol with out ESR scenario so i decided to go with os command level option present in the file adapter.Could you please help me guys.

Thanks

Giridhar