Custom Time Zones with Shading

Set vertical lines at 8am, 9:30am, noon, 4pm, NY time. Times can be modified, line colors can be modified.
Set chart shading from 4pm (last line time) to 8am (first line time) and a second shade from 8am to 9:30am.

This puts visuals for NY session start/end and one additional highlight for mid-session.