Regular vs Electronic Trading hours Gap (RTH vs ETH); 4pm-9:30am

-Shows the gap between 4pm close and 9:30am open; the Regular trading hours Vs Electronic trading hours Gap (RTH vs ETH).
-Displays this as a box starting at 9:30am, whose bottom is the 9:30am open; top is previous day's 4pm close.
-Displays when chart is toggled to either of ETH or RTH.
-Useful reminder of area above/below opening bell price that price often has a tendency to want to fill in, partially or fully
--(all times here refer to America/New_York timezone)

//Options:
~Number of past boxes to show
~Extend boxes fully to the right
~Box background color, border color, and opacities

//Limitations:
-works only on timeframes 30mins or lower (works on 1,2,5,10,15,30minutes)
-will not work on non-typical low timeframes (like 4min or 7min) since they are not divisible into 30

Catatan Rilis:

-Added 4pm close line (extends into next day's close), to anticipate the far side of the RTH gap before the opening bell at 9:30am
-Note this will not work properly on Holiday sessions (like this monday 21st Feb) when there is no 4pm close

Catatan Rilis:

-Added price label option for 4pm lines
-Added box text label option

Catatan Rilis:

-update cover chart

Catatan Rilis:

-Updated to be versatile across ES, SPX, SPY(whether on RTH chart or ETH chart).
-Fixed small error in timing

Catatan Rilis:

(fixed typos)

Catatan Rilis:

-lines & labels formatting; update description comments

Catatan Rilis:

-Added time offset (in minutes, 5minute steps) for non-USA based Indices traders. Default is zero, but for example you might set each of the two offsets to '-300' for a London based index.
-Make sure offset minutes are divisible into the chart's timeframe or it will not plot.

Catatan Rilis:

-Added High-Low gap: for the gap between last RTH bar high/low and first RTH bar low/high (4:15pm - 9:30am NY time).
-Added color/formatting options.
-Thanks to @Ryazn for the idea of adding these High/Low gaps, and demonstrating to me their especial sensitivity to price.