I want to see how responses trend over time or perform time series analysis

The only way to show how results change over time is to include a question in the data set that has categories for each time period that you want to examine. You can then use this in a cross-tab or chart with your other questions. DataCracker does not currently make use of any information encoded as dates.

DataCracker also does not perform time series analysis (such as moving averages or dynamic changes in time periods).  There is more complex (and expensive) software that can do so.  See http://mktresearch.org/wiki/Choosing_Survey_Analysis_Software

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