After reading about changing the time, to progress events. i figured why not but should of tested on a new map as my game is stalled.

While under deathclaw attack and then quiting and changing back to normal time again will not close off the attack event with the time being in negative number, the entire game stalls really. Only setting back the date/day to when the problem started with a positive number after the event will close it off, now after that will be back in normal mode and can then continue back to normal time again and continue play.

hope this helps