Trying to figure out what is the best time to run the "grab" for epgs to set cron job and does grab merge the epgs?

[DimSumDev]

I notice when running the "grab" it grabs it for the next day and not current day. (for my time zone CST)

I'm trying to set a cron job on my server so I can pull the epg every 3 days (seems 3 days of programming and my 'maxConnections` settings causes the least errors and is fairly stable.

So the question is, for U.S. CST what is the best time to schedule these jobs? is it 11:59 pm or should I got for a certain UTC time?

Also, does the npm grab keep or is there a way to merge copies so I have a day back and the new 3 day pull or should I just pull a full week?