Get data of 1 candle before when going from daily to Weekly/Monthly Chart.

I use my indicator mostly on Daily charts, but when I go from Daily to Weekly/Monthly I have to recalculate because the date is not the same.

Even if I go from H1 to D1 it will happen, because the hour is not the same.

On H4, bar is 24/05/2021 4pm. On D1, bar is 24/05/2021 9pm. On W1, bar is 23/05/2021 9pm or 30/05/2021 9pm. On M1, bar is 31/05/2021

How can tell my indicator to go 1 candle before when I timeframe up?

            IconExists = true;
            DateTime IconTime2;

            if (IconExists)
            {

                IconTime2 = VWAPIcon2.Time;
                
            }
            else
            {

                IconTime2 = v2.Time;
            }
            
            double VWAP_Price = VWAP[Bars.OpenTimes.GetIndexByExactTime(IconTime2)];
            double Source_Price = VWAPTPrice[Bars.OpenTimes.GetIndexByExactTime(IconTime2)];