OK, so lets start with the formatting of the date, I believe, as you're still learning, that you should make the most of the commands, and not take the easy way out, so instead of using a regex to extract your date, we can use the convert functionality.
So;
convert timeformat="%b %d %H:%M" ctime(_time) as Time
This will transform your _time stamp into the format that you require, into a new field called Time
What do you mean by *5?
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