Before anyone uses the "get a job" line on me, I have two. both evenings so only time I can play is during the day. It's been the same on a lot of MMO's, they all default to US time. However there have been MMO's to have different downtime in EU and USA, makes sense when there are usually more EU players and US. Some even have daily downtime yet for shorter periods so patches are spread out rather than one big bulk of fixing on one day.
We all understand there is a need for downtime, but there really be different time zone patching between the US and EU