There was mention of 'maybe' implementing different time zones for the survey reports (everything is currently on Texas time, I think) back in Septmeber 2008, and SurveyGizmo said that they are working on releasing a new version in the coming months that will have adjustable time zones (I am in UK, on GMT, and it's a bit annoying to see that people have been completing my survey at “3am”). Has there been any progress on this? It seems like it would not be a difficult feature to add; the server simply adds or subtracts the appropriate time zone difference when the survey is submitted by the user.
Maybe the survey results could additionally show the user's local time setting (it might be useful to know if most people fill out your survey in the morning rather than the evening…maybe).