Calculate cumulative volume during premarket for any day in the past

[kkrac]

I have the following code that returns cumulative volume during premarket hours for today.
How can I update it so I can calculate cumulative volume during premarket hours for any day in the past, in the 1 minute chart?
I think I have to start looking 390 * X days back? But I'm missing something and can't make it work.

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;

# This is the cumulative volume for the current day
def totalVolume = if targetPeriod and !targetPeriod[1] then volume
                  else if targetPeriod then totalVolume[1] + volume
                  else totalVolume[1];

plot signal = totalVolume;

 

[halcyonguy]

I have the following code that returns cumulative volume during premarket hours for today.
How can I update it so I can calculate cumulative volume during premarket hours for any day in the past, in the 1 minute chart?
I think I have to start looking 390 * X days back? But I'm missing something and can't make it work.

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;

# This is the cumulative volume for the current day
def totalVolume = if targetPeriod and !targetPeriod[1] then volume
                  else if targetPeriod then totalVolume[1] + volume
                  else totalVolume[1];

plot signal = totalVolume;

in this study,
https://usethinkscript.com/threads/...he-rth-of-previous-10-days.15336/#post-125633
i created a reverse day counter, right to left, and checked its value to determine which days near the end of the chart to read data from.
revdaycnt =