If we get rained out one day, that bumps All the jobs after that out one day back

since these are All separate projects, it takes up ALOT of time to push them all back a day - not to mention there is no easy way to do it since we have dependency's set in all our projects. 

Is there a way to MASS move all the projects at once?  Or do I have to individually have to move 30+ projects back one day?  

If I do need to individually move ALL the jobs back one day, how would you recommend that I do this when I am on a time constraint?