I've been using ConvertToLocalTime with much success for over a year; e.g.
ConvertToLocalTime( gmt_date_time, 'Eastern') as [Eastern Date];
Recently we started deploying our documents to a QV server in Japan. One thing we've seen is that the ConvertToLocalTime function doesn't seem to work in that environment. Instead of an adjusted timestamp, the above expression returns 'Eastern?'. I tried converting the locale 'Eastern' to it's Japanese equivalent string representation (using Google Translate: 東の ) and now I get '東の?' back.