如何在松树脚本中绘制直到昨天而不是当天的标签

如何解决如何在松树脚本中绘制直到昨天而不是当天的标签

study("temp",overlay=true)
startDate=input(title="StartDate",type=input.time,defval=timestamp("01 Jan 2000 09:15:00 
  UTC+5:30"))
// newDay=change(time("D"))!= 0
// _year=valuewhen(newDay,year[1],0)
// _month = valuewhen(newDay,month[1],0)
// yday = valuewhen(newDay,dayofmonth[1],0)
// yesterdays_ts = timestamp(_year,_month,yday,15,30)
endDate=timestamp("UTC+5:30",year,month,dayofmonth,30,00)
labelSession=input(title="Time session to analysis",type=input.session,defval="0915-1525")
inSession(sess)=> na(time(timeframe.period,sess + ":23456")) == false 
  and time >= startDate and time<= endDate 
  dayLow()=>security(syminfo.ticker,"D",low,lookahead=true)
if inSession(labelSession) and not inSession(labelSession)[1]  
   label.new(bar_index,dayLow()-20,"Hello",style=label.style_label_left,textalign=text.align_left,color=#d0cec2,textcolor=color.black)

如果我运行我的代码，我会得到这样的输出“out put image”，但我想打印标签直到昨天，只是如何实现