OPC/Custom Functions for Calc Server Error

When I create an application and use the DeltaTotalCount aggregate with the end time in the future (based on the duration and start time) The calculation seems to truncate to Now and works fine. But in the Calc Server if I use the same aggregation and the end time is in the future, I get an error that 'Some part of the aggregate interval is in the future'. How can I get the same functionality as in the application in the calc server?