Querying Journal Files

Hi everyone,

I am trying to extract some information from a journal file, namely, I want to get the time that a revision was created in the project to track how much time was spent on that revision.
I can see the event that was triggered in the journal file when the revision was created

But there are a few things I am unsure of. Firstly I would like to get the datetime of this block, how would I go about identifying the block number of this part of the journal file?

Dynamo says that there are 5462 lines in the journal file, but the journal file itself says there are 6920, so I am unsure how to go about isolating that line or block, can anybody provide some advice on this?
For a start, I would just like to get the time that the add Revision event was initialized.

Any advice would be appreciated! Thanks very much.