For wastelanders there's actually a 2nd cheat that can get you bunch of cool stuff. especially when you messed with the timer as much as 70days ahead.
to do that, first fast forward your time 70days ahead, so that you are able to call back all your wastelanders. Make sure everyone's back.
Next, go to Settings->Turn your date and time back to automatic setting 'on'. You might want to fully exit the game while doing this but I doubt there's any difference.
Send your wastelanders out to explore. Try to send those with maximum endurance and luck for maximum effect.
You will realize they will collect nothing nor lose any health after many days.
Now, back to Setting->turn your time and date setting 'off', then fast forward by 70-72days.
go back to the game and you will find your wastelanders having collected tonnes of cool weapons (above level 10) and outfits which are highlighted in blue. you will be earning tonnes of caps as well, and your wastelanders will not have encountered any enemies.
This is the tricky part. to call back your wastelanders in the shortest time, after they have collected all those cool stuff, once again, go to setting, turn your clock back to 'automatic on'.
Return to the game and you will find that stuff collected remains there, but the explored time will be a few minutes, now recall your wastelanders and collect those items.
Not sure whether this works for everyone though. Now I have a population of 110 and all of them are equipped with weapons level 12 and above. deathclaws still attack my vault every 15-30min, but they hardly reach my 3rd level anymore.