set sane format for archived logs, so the files would be sortable
ideally this should came from config (date_format=iso8601)

--- nagios-3.2.3/base/logging.c~	2009-05-22 03:55:21.000000000 +0300
+++ nagios-3.2.3/base/logging.c	2010-12-04 23:33:52.112688537 +0200
@@ -397,8 +397,7 @@
 	stat_result = stat(log_file, &log_file_stat);
 
 	/* get the archived filename to use */
-	asprintf(&log_archive,"%s%snagios-%02d-%02d-%d-%02d.log",log_archive_path,(log_archive_path[strlen(log_archive_path)-1]=='/')?"":"/",t->tm_mon+1,t->tm_mday,t->tm_year+1900,t->tm_hour);
-
+	asprintf(&log_archive,"%s%snagios-%04d-%02d-%02d-%02d.log",log_archive_path,(log_archive_path[strlen(log_archive_path)-1]=='/')?"":"/", t->tm_year+1900, t->tm_mon+1,t->tm_mday,t->tm_hour); 
 	/* rotate the log file */
 	rename_result=my_rename(log_file,log_archive);
 
--- nagios-3.2.3/cgi/cgiutils.c~	2010-12-04 21:34:34.000000000 +0200
+++ nagios-3.2.3/cgi/cgiutils.c	2010-12-04 23:34:28.915968009 +0200
@@ -1604,7 +1604,7 @@
 	t=localtime(&this_scheduled_log_rotation);
 
 	/* use the time that the log rotation occurred to figure out the name of the log file */
-	snprintf(buffer,buffer_length,"%snagios-%02d-%02d-%d-%02d.log",log_archive_path,t->tm_mon+1,t->tm_mday,t->tm_year+1900,t->tm_hour);
+	snprintf(buffer,buffer_length,"%snagios-%04d-%02d-%02d-%02d.log",log_archive_path,t->tm_year+1900,t->tm_mon+1,t->tm_mday,t->tm_hour);
 	buffer[buffer_length-1]='\x0';
 
 	return;