How to delete archivelogs ???????

Question

Dear Experts,
I am looking for a way to delete archive logs through RMAN's backup command, something like this:
BACKUP ARCHIVELOG all delete input until time 'sysdate-5/24';
We are on Oracle 10g Release 2 (10.2.0.3), IBM - AIX 5.3.
I would like to retain archivelog's generated in the last 5 hours on disk and let RMAN delete anything else older than that. When I am using the above command, RMAN is throwing errors on my face:
RMAN>  BACKUP ARCHIVELOG all delete input until time 'sysdate-5/24';
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00558: error encountered while parsing input commands
RMAN-01009: syntax error: found "until": expecting one of: "archivelog, backup, backupset, channel, copy, controlfilecopy, current, database, datafile, datafilecopy, delete, diskratio, db_recovery_file_dest, filesperset, format, from, force, include, keep, (, maxsetsize, noexclude, nokeep, not, pool, plus, reuse, recovery, ;, skip, spfile, setsize, tablespace, tag, to"
RMAN-01007: at line 1 column 36 file: standard input
RMAN>I know RMAN has DELETE command but we are having issues when using BACKUP and DELETE. We are receiving intermittent errors during BACKUP command due to media manager and the backup fails. However, RMAN script continues and is happily removing archive logs from disk whether backed up or not.
I did try to look into manuals and google, but I think I am little dumb to extract information.
Your help is appreciated.
Regards
Edited by: Oracle Lover3 on Nov 16, 2008 11:45 PM
OS & DB version added

Answer 1

Try
RMAN> run
2> {
3> set until time "to_date(to_char(sysdate-5/24,'DD-MM-YYYY HH24:MI:SS'),'DD-MM-YYYY HH24:MI:SS')";
4> backup archivelog all delete input;
5> }I think it will not work i have tested it recently..
Khurram