Let's say I want to recover a tablespace using an image copy taken at 6am this morning and then apply the logs up to 11am. I use TORBA option to perform recovery, but I don't know the RBA of 11am. There was no QUIESCE performed for any tablespace between 6am and 11am. Is there some way to convert "11am timestamp" to RBA? How can I perform PIT recovery without knowing the RBA?