I am new to the environment and have a question regarding SetStartDate method. 

I set the start date using the codes below.

self.SetStartDate(DateTime(2013, 10, 7, 10, 0, 0))  # Set Start Date

When I check the log, the log shows the first data point comes in for time 2013-10-07 9:31:00, even though I set the starting DateTime to 2013-10-07 10:00:00. 


Could anyone explain what I am missing and what causes the discrepancy?

Thanks for the help in advance.