which website show correct economic calendar news event?

 

I want to backtest my EA on news event in the past 10 years, but...

I don't think we can backtest news filter, because all website news event history are wrong

fxstreet.com
investing.com
forexfactory.com

myfxbook.com

all this 4 websites news events are so difference from each other. Does anyone have any idea which website show correct news event?



 
FX Streeet is the best. I also have Bloomberg terminal and the accurate and speed is really helpful..