各位大佬，询问关于Rman基于时间点恢复的问题

sa_hata

恢复脚本与错误信息如下：
RMAN> run{
2> sql'alter session set NLS_DATE_FORMAT="yyyy-mm-dd hh24:mi:ss"';
3> set until time "to_date('2008-03-27 10:40:02','yyyy-mm-dd hh24:mi:ss')";
4> restore database;
5> recover database;}

正在开始介质的恢复
无法恢复介质
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 03/27/2008 11:04:13
RMAN-11003: failure during parse/execution of SQL statement: alter database reco
ver if needed
start until time '3月  27 2008 10:40:02'
ORA-01861: 文字与格式字符串不匹配

环境
操作系统
简体中文win2000
oracle
NLS_CHARACTERSET= ZHT16BIG5
NLS_DATE_FORMAT= DD-MON-RR


请问，怎么才能正确恢复，谢谢