input sessionStartTime = 2000;
input sessionEndTime = 2230;

def day = GetDay();
def lastDay = GetLastDay();
def isToday = day == lastDay;
def isTargetPeriod = SecondsTillTime(sessionStartTime) <= 0 and SecondsTillTime(sessionEndTime) > 0 and isToday;

def targetPeriodHigh = if isTargetPeriod and high > targetPeriodHigh[1] then high
  else targetPeriodHigh[1];
def pmHigh = HighestAll(targetPeriodHigh);

plot pmHighPlot = if isTargetPeriod then pmHigh else Double.NaN;
pmHighPlot.SetDefaultColor(Color.YELLOW);


def targetPeriodLow = if !isTargetPeriod then Double.POSITIVE_INFINITY
  else if isTargetPeriod and low < targetPeriodLow[1] then low 
  else targetPeriodLow[1];

def pmLow = LowestAll(targetPeriodLow);

plot pmLowPlot = if pmLow > 0 and isTargetPeriod then pmLow else Double.NaN;
pmLowPlot.SetDefaultColor(Color.YELLOW);