I'm building a C# .Net application that gets criterion stats using the criterionService. It seemed to work fine at the begining but when you looked at the results and compare it to Google's web interface you see you don't always get the right results. The problem apears to be with the GMT differences because when on pacific time a new day begins i still get yesterday's results but when i add 1 day to my startDate parameter it gives me the right result (for the new day as well).