Agreed.  I think the date needs to be static and a bit of warning within 24 hours would be dandy.   If the date and time were set in stone though, there would be no need for warning, it could just be posted publicly and spammed like once every 15 minutes or so as an advert.  Seems like something has to be done manually and busyness has prevented it from happening on schedule in the past.  Maybe this is something that can be reduced to running a script under supervision? 

Just spitballing since I really don't have a clue what the reset process involves exactly, but it seems the solution here is just to nail down a precise date and time (like the 1st of each month at midnight) and a delivery method where it can't get pushed to the backburner and causes minimal downtime.

I presume another reason why it has to be done manually is they might actually go and check out the worlds to make sure they're okay for people to be running around in. Such as that the mining world has all the biomes in it/etc, it'd be upsetting to have a whole month where one biome just completely isn't accessible for anyone to get supplies from after all.