User Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:33.0) Gecko/20100101 Firefox/33.0 Build ID: 20141015221143 Steps to reproduce: The new charts feature creates information starting at the time of the series creation. When I migrate from another bug tracking system, I have historical information, which are older than the series creation time. Let's assume I have bug information from 1995 - 2014, which I would like to create charts for and I'm about to create a new series in 2014. Once the collectstats.pl script is run, I am getting series data with a value set starting in 2014, which aggregates all historical data from 1995 - 2014 in a single value, which defines the start value of the graph. What I would want is not an aggregation with a start in 2014, but values, which also provide information about the time frame between 1995 and 2014. How am I able to create those information?
New Charts do not let you go past the time when you first created them. They always run queries on current data, not past data. So that's not something you can do. What you would like is something like bug 380878.
So, effectively there is no meaningful charting available right now.