[Bro] Overwriting logs

[john Y]

Hello all!
Need advice about a problem i have:

I am initiating many bro command on dynamically incoming pcaps, such as:
"bro -r some_file_name".

On every run, logs are created in the same directory, but the next run
rewrite those logs. How can bro create logs with uniqe log name foreach run?

Also tried to add timestamp to the log name but did not find how to get
current time.

Love for your help,
John
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