The answer is yes and no. Yes because it can show 4am to 8pm, no because it only will show data for about 2 1/2 days. But it works for me. I like trading the the 15min ext (extended) chart.
As you can see I got in late Thur and rode Fri rise. Still long as futures were flat into the 8pm shut down. I do almost no trading pre-market, but I am trading AH all the time.
I have been playing the chart pretty conservatively, but I am starting to get more aggressive. Thru had a very nice wave 3 setup about 11am, great place to enter.
Chart is now pretty topped out, so expecting a sell signal Monday and what I expect to be another small reset.
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