TOS script for London & Asian sessions · InvestCEO with Kyle Henris

Aug 26 (edited) • Tech-Software discussion

TOS script for London & Asian sessions

I had ChatpGPT write a script for me so I can quickly see the London and Asian sessions in ThinkorSwim. It works as is with whatever timezone you have TOS set to. It's helpful to me, so I just thought I'd share. Here you go! (I also included a screenshot of the study I use to auto-draw the daily high/low.

# Session Highlighter (ET): Asian & London (very faint colors)

# - Asian: 6:00pm ET → 3:00am ET

# - London: 3:00am ET → 12:00pm ET

input showAsian = yes;

input showLondon = yes;

# Ultra-light pastel fills

DefineGlobalColor("AsianFill", CreateColor(245,235,255)); # ultra-light lavender

DefineGlobalColor("LondonFill", CreateColor(230,245,255)); # ultra-light blue

def intraday = GetAggregationPeriod() < AggregationPeriod.DAY;

# Asian session: 18:00 → 03:00 (spans midnight)

def inAsian = intraday and (SecondsFromTime(1800) >= 0 or SecondsTillTime(0300) > 0);

# London session: 03:00 → 12:00 (no midnight span)

def inLondon = intraday and (SecondsFromTime(0300) >= 0 and SecondsTillTime(1200) > 0);

plot aTop = if showAsian and inAsian then Double.POSITIVE_INFINITY else Double.NaN;

plot aBot = if showAsian and inAsian then Double.NEGATIVE_INFINITY else Double.NaN;

plot lTop = if showLondon and inLondon then Double.POSITIVE_INFINITY else Double.NaN;

plot lBot = if showLondon and inLondon then Double.NEGATIVE_INFINITY else Double.NaN;

aTop.SetDefaultColor(GlobalColor("AsianFill"));

aBot.SetDefaultColor(GlobalColor("AsianFill"));

lTop.SetDefaultColor(GlobalColor("LondonFill"));

lBot.SetDefaultColor(GlobalColor("LondonFill"));

aTop.SetPaintingStrategy(PaintingStrategy.HORIZONTAL);

aBot.SetPaintingStrategy(PaintingStrategy.HORIZONTAL);

lTop.SetPaintingStrategy(PaintingStrategy.HORIZONTAL);

lBot.SetPaintingStrategy(PaintingStrategy.HORIZONTAL);

AddCloud(aTop, aBot, GlobalColor("AsianFill"), GlobalColor("AsianFill"));

AddCloud(lTop, lBot, GlobalColor("LondonFill"), GlobalColor("LondonFill"));

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