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Hello Pete, I hope all is well. I wanted to know if it was possible to create scan alerts than only trade in the premarket hours and can even send email/ text alerts between 6am and 9:30am est.
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I have no idea. Try it out and see. Use this for the scan:
Use the method described in this video to create your dynamic alert from the saved custom scan. (begins at the 29:50 mark) https://www.hahn-tech.com/thinkorswim-overnight-range-scan-alert/ Caution! Make sure you apply a top level filter consisting of just a handful of ticker symbols. Otherwise you may blow up your inbox. Marked as spam
 Posted by Pete Hahn (Questions: 37, Answers: 4118) Answered on August 18, 2019 12:34 pm
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There is nothing in the Thinkorswim language that determines whether a scan can function during extended hours session. It either works, or it doesn't. No amount of code can change that. If it doesn't work then there is nothing we can do to make it work. However if you select a daily or higher time frame for your Study Filter this will absolutely not work during extended hours sessions. So the only thing within our power is to set the time frame for the Study Filter to intraday time frame, and check the box to included extended hours.
To more directly answer your question. "close[1]" references the closing price of the previous candle. "close" references the closing price of the current candle. Even if that candle is still the active candle for the selected time frame.
If it does not work, then you need to submit this to Thinkorswim support as a bug or a feature request.