How to Stamp a Custom Value @ MKT Open and Calculate the Difference

[westonsloan]

I need help -- I need to stamp a custom value in place that is calculated as soon as market opens at 830AM CST / 930 ET. I intend for this value to remain static so I can calculate the difference. I intend to have further calculations after this value gets stamped in place. This data needs to be stamped within 1 minute of market open. This code is currently ran in a watchlist column on "Daily."

Once the value is stamped -- I need to be able to see the difference between the stamped value and the continuous difference value.

For example -- if @ 830AM market open I need the POWER value (PremarketVolume(period = "Day").Power) to get stamped in place as a static integer of ".0500" within 1 minute of market open -- then that is the new baseline I need it to automatically calculate the difference from the stamped value of "0.500" to whatever it grows to.

Let's say in 15 minutes @ 845AM, it grows from the stamped Power value of "0.0500" (recall this was stamped at market open) to "0.0650" -- then I need the column to show me the resulting difference of "0.0150" in the same watchlist column. I need to be able to sort ascending and descending on the results. I dont need the color conditional formatting.

Definition of done for this question is at least being able to stamp the POWER (PremarketVolume(period = "Day").Power) value in a watchlist column or as a new study or as a label in a new study set on Daily aggregation. The study is ran on "Daily" aggregation in thinkorswim watchlist column.

For the love of God and everything holy and natural -- please somebody assist me with this. Godspeed

script PremarketVolume {
plot Data = close;#PreMarket Volume
input startTime = 0400;
input endTime = 0929;
def startCounter = SecondsFromTime(startTime);
def endCounter = SecondsTillTime(endTime);
def targetPeriod = if startCounter >= 0 and endCounter >= 0 then 1 else 0;
rec volumeTotal = if targetPeriod and !targetPeriod[1] then volume else if targetPeriod then volumeTotal[1] + volume else volumeTotal[1];
AddLabel(yes, Concat("PreMarket Vol: ", volumeTotal), Color.VIOLET);


#Relative Volume
input ShowPreMarketRV1 = yes;
def volLast50DayAvgRV1 = (volume(period = "DAY")[1] + volume(period = "DAY")[2] + volume(period = "DAY")[3] + volume(period = "DAY")[4] + volume(period = "DAY")[5] + volume(period = "DAY")[6] + volume(period = "DAY")[7] + volume(period = "DAY")[8] + volume(period = "DAY")[9] + volume(period = "DAY")[10] + volume(period = "DAY")[11] + volume(period = "DAY")[12] + volume(period = "DAY")[13] + volume(period = "DAY")[14] + volume(period = "DAY")[15] + volume(period = "DAY")[16] + volume(period = "DAY")[17] + volume(period = "DAY")[18] + volume(period = "DAY")[19] + volume(period = "DAY")[20] + volume(period = "DAY")[21] + volume(period = "DAY")[22] + volume(period = "DAY")[23] + volume(period = "DAY")[24] + volume(period = "DAY")[25] + volume(period = "DAY")[26] + volume(period = "DAY")[27] + volume(period = "DAY")[28] + volume(period = "DAY")[29] + volume(period = "DAY")[30]) / 30 + volume(period = "DAY")[31] + volume(period = "DAY")[32] + volume(period = "DAY")[33] + volume(period = "DAY")[34] + volume(period = "DAY")[35] + volume(period = "DAY")[36] + volume(period = "DAY")[37] + volume(period = "DAY")[38] + volume(period = "DAY")[39] + volume(period = "DAY")[40] + volume(period = "DAY")[41] + volume(period = "DAY")[42] + volume(period = "DAY")[43] + volume(period = "DAY")[44] + volume(period = "DAY")[45] + volume(period = "DAY")[46] + volume(period = "DAY")[47] + volume(period = "DAY")[48] + volume(period = "DAY")[49] + volume(period = "DAY")[50];
def x = volLast50DayAvgRV1;
def totalvol = volumeTotal;
plot r = Round(volumeTotal/(volume(period = "DAY")[1]),1);
plot b = Round((volume(period = "DAY")/volumeTotal),1);
def PreMarketRv1 = r;
def PMRV1DailyVol = b;
AddLabel(yes, Concat("PreMarket Vol RV1: ", PreMarketRV1), Color.LIGHT_GRAY);
input period = { "1 min", "2 min", "5 min", default "10 min", "15 min", "30 min", "60 min", "4 hours", "Day"};

def xvolume = (volume(period = "DAY")[1]);
def vvol = (volume(period = "DAY"));
plot rvolx = Round((vvol/xvolume),1);
def rvolxapi = rvolx;
def Power = (rvolxapi/PreMarketRV1);
AddLabel(yes, Concat("Power: ", (rvolxapi/PreMarketRV1)), Color.Light_orange);
}
def Power = reference PremarketVolume(period = "Day").Power;
AddLabel(1, Power, if Power < Power[1] then Color.RED else if Power > Power[1] then Color.Light_ORANGE else Color.WHITE);