No more or less than we can say "We're staying on standard time year-round". We've adjusted when DST starts relatively recently (twice, I think), and it seems several countries have semi-permanently shifted to DST: http://www.timeanddate.com/news/time/

Computers pick up on published timezone databases automatically (there was a big mess a couple years back when someone tried to copyright it or something, and they ended up backing down), so any software that can handle any form of DST should have no problem with a permanent shift - and probably by any amount.