I have been using EventVestor Earnings Calendar Data for the past couple of weeks, a couple of days ago I needed the data for 2015, so I bought the dataset. But interestingly, now I cannot run backtests with starting date before 2009-07-10, it says the dataset starts at 2009-07-10. I tried the same algorithm on a different account (which does not have premium data) and it works just fine for earlier dates. It seems that the premium data set begins later than the free version.
I have pasted the error below:
NoDataAvailable: Backtest began on 2007-01-02 and ended on 2016-01-01, but some of the requested datasets do not have data for this time. The datasets are: eventvestor.earnings_calendar: start=2009-07-10, end=2016-07-23. Your backtest must begin on or after: 2009-07-10 and end on or before: 2016-07-23.