I made a code that reads the My Documents\Assetto Corsa\personalbest.ini file and reads car@track record and grab the TIME=, then transform it to seconds.milliseconds. We calculate delta = EstimatedLapTime - PersonalBestLaptime. We format it to have only 2 decimals, and we add a "+" if it's possitive.

root.BestLap = 0;
root.Car = ucase($prop('CarId'));
root.Track = ucase($prop('TrackCode'));
root.Estimated = timespantoseconds($prop('PersistantTrackerPlugin.EstimatedLapTime'));
root.Delta = 0;

root.Key = "\r\nDATE=\r\nTIME=";

root.Content = readtextfile('F:\\Documentos\\Assetto Corsa\\personalbest.ini');

root.Regex = new RegExp("\\*?TIME=(\\d+)", "i");
root.Match = root.Regex.exec(root.Content);

if (root.Match) {
  root.BestLap = parseInt(root.Match);
}

root.Time = root.BestLap.toString();
root.Seconds = root.Time.slice(0, -3);
root.Milliseconds = root.Time.slice(-3);
root.FormattedTime = root.Seconds + "." + root.Milliseconds;
root.Delta = root.Estimated - root.FormattedTime;

root.Delta = root.Delta.toFixed(2);

if (root.Delta > 0) {
  root.Delta = "+" + root.Delta;
}

return root.Delta;

My Documents > Assetto Corsa > Personalbest.ini

It shows something like this:

DATE=1680542334000
TIME=58001


DATE=1680544212913
TIME=61494


DATE=1680544860305
TIME=62898


DATE=1680545328561
TIME=57147

With this code, I was able to grab the TIME= of the specified CAR@TRACK in personalbest.ini and It was working, but I made a new personal best, and stopped working, now shows value 0.

root.BestLap = 0;
root.Car = ucase($prop('CarId'));
root.Track = ucase($prop('TrackCode'));

var key = "\r\nTIME=";

var content = readtextfile('F:\\Documentos\\Assetto Corsa\\personalbest.ini');

var regex = new RegExp(key + "(\\d+)");
var match = regex.exec(content);

if (match) {
  root.BestLap = parseInt(match);
}

return root.BestLap;

Sidekick creates other files but not the personal best files, but If i go to Content Manager > Lap Times > Sources, and I click on Export to Sidekick, then all the personal best times of all the cars in all maps appears in Sidekick folder, so I am gonna try to search in the assetto corsa folder any file that save all the personal best times.. crossing fingers.

I really need to have Personal best time + Personal best time delta instead of Session, but I don't know what to do. My brain is gonna explode. 😆 😆 

First lap was 1:05:284 doing cut.

Second lap was 1:08:511 without doing cut.

Third lap was 1:13:647 without doing cut.

Sidekick saved an archive called "ks_ferrari_fxx_k_ks_monza66-junior_pb.ini" on "assettocorsa\apps\python\Sidekick\personal_best"

Opening the file with Notepad, shows this:

€L68511
.

Avoiding that weird icons, the first 2 numbers are the seconds and third last numbers are the milliseconds of the best lap without doing cut, in that track (Monza Junior) with that car (Ferrari FXX K).

It would be possible then to load that file deppending of the car name and the track name and detect that best time in Simhub?

Something like this is on my head:

open file "assettocorsa\apps\python\Sidekick\personal_best\*_*.ini"
read the file and apply point or comma between 3rd and 4th number starting from right, so we have time in seconds (68.511) with the "Ferrari FXX K" on "Monza Junior", then we can transform this to time, 1:08:511.

With that time formated, we can show Best absolute lap without doing cut, thanks to Sidekick is creating files of our best laps without doing cuts.

With the same time in seconds (68.511) we can make our own delta, calculating estimatedLapTimeInSeconds - bestTimeInSeconds.

var time = $prop('GameRawData.Graphics.BestTime');
var parts = time.split(":");
var minutes = parseInt(parts);
var secondss = parseInt(parts);
var miliseconds = parseInt(parts);
var totalTime = minutes * 60 + seconds + miliseconds / 1000;
var estimated = timespantoseconds($prop('PersistantTrackerPlugin.EstimatedLapTime'));
var delta = estimated - totalTime;

var deltaString = delta.toFixed(2);
if (delta > 0) {
  deltaString = "+" + deltaString;
}

root.Delta = deltaString;

return root.Delta;

Now, it's time to think if its possible to create the same with best lap record in each map with each car + delta for that record lap, I think that's not possible. The Fx should load the best lap ever made in that car and in that map, getting the info on a local file in my computer, or loading the info from Content Manager, then in "Fx" check lap validity each time I make a lap, and if lap is valid and lap is record, it should save the record on the .txt overwriting it. Or if is possible to get the time of Content Manager it should way easier, but I think both are not possible, right? @romainrob

Maybe we will have to live with the information (record + delta of the session) and not with the absolute record lap + delta to the absolute record lap..?

RESULT: null

var estimate = $prop('GameRawData.Graphics.BestTime');
return estimate;

RESULT: 1:28:334

I can't understand xD

I will try in future make an ALL BEST TIME + ALL BEST TIME DELTA checking both for valid and invalid laps, but while I do that, I would like to have BestSessionTime, BestSessionTimeDelta and BestSessionTimeDeltaProgress, but I think that's not possible (Maybe BestSessionTimeDeltaProgress is possible checking if estimated lap time is increasing or decreasing)

I am so sad to be honest. Why Assetto Corsa give wrong values and doesn't check if lap is valid or not to register it? It's so hard coding all this only for make useful the display with Simhub..

I am trying to make my own best session time delta, I don't know if It's logic or not, but I am trying 

My actual code is:

var deltasession = secondstotimespan(timespantoseconds($prop('PersistantTrackerPlugin.EstimatedLapTime')) - timespantoseconds($prop('GameRawData.Graphics.BestTime')));

return deltasession;

I transform to seconds the "$prop('PersistantTrackerPlugin.EstimatedLapTime')" and the best session valid time "$prop('GameRawData.Graphics.BestTime')" to seconds to calculate the difference, but result is not logic. Seems that "$prop('GameRawData.Graphics.BestTime')" can't transform to seconds.

I tried this code to transform "$prop('PersistantTrackerPlugin.EstimatedLapTime')" to seconds and It works:

var bestlapsession = $prop('GameRawData.Graphics.BestTime');

if (bestlapsession == null) {
	bestlapsession = '0';
}

function timespantoseconds(timespan) {
  if (typeof timespan !== 'string' || timespan.length < 8) {
    throw new Error('El argumento debe ser una cadena de texto válida en formato "mm:ss:fff".');
  }
  var timeParts = timespan.split(":");
  var totalSeconds = parseInt(timeParts) * 60 + parseInt(timeParts) + parseFloat(timeParts) / 1000;
  return totalSeconds;
}

var bestlapseconds = timespantoseconds(bestlapsession);

return bestlapseconds;

But I don't know how to make both work together and make the calculation of "ESTIMATED - BEST SESSION LAP" to show the difference in +0.00;-0.00

Coding is haaaaaaard