recover database until time

All:

I am trying to get the recover database until time option to work.

I took the following steps

1) created a table and added 25 rows to it and at 10:30AM

2) I shutdown the database

3) I backed up the data file associated with the tablespace.

4) I startuped database

5) 10:35AM I dropped the table.

6) shutdown database

7) I restored datafile from back

8) startup mount database

9) recover database until time '2009-02-25:10:30:00';

I get the following erorr: ORA-00283: recovery session canceled due to errors
ORA-19907: recovery time or SCN does not belong to recovered incarnation

Is there a table I need to query first to find the correct time I can recover
too? Or is there something wrong with my test case. If so, can somebody
please correct

Thanks in advance to all who answer this post

I'm not sure you got the concept of point-in-time recovery... it relies on having hot backups followed by archivelog backups. It seams to me you are attempting point-in-time recovery with a cold backup.

These are the instructions I found on-line, granted they are old but what step am I missing.

Incomplete Recovery Using Time-Based

Scenario: The current time is 12 pm on 9-Mar-01 and someone dropped the
EMP table around 11:45 am. The table must be recovered.
If the database is open, shut it down using either the "normal" or "immediate" options: SVRMGR> shutdown normal;

Mount the database:
SVRMGR> startup mount pfile=Oracle\admin\mike\pfile\init.ora;
Restore all datafiles(*.dbf) from the most recent backup. (Do not restore
the Control file, Redo Logs, or Parameter files.)
UNIX> !cp /disk1/backup/*.dbf /disk1/data/
NT > !copy c:\backup\*.dbf c:\data\

Recover the database: SVRMGR> recover database until time '2001-03-09:11:44:00';

To synchronize datafiles with control files and redo logs, open database using
"resetlogs" options:
SVRMGR> alter database open resetlogs;

Any data entered after the recovery time (11:44 am) will need to be reentered.
Perform a closed whole backup

The hot backup part perhaps?