From which table i can get FIRST CONFIRMED DATE in sales order schedule lines... SAP SD

Hi,

I have created a sales order,system confirmed quantity on 02/16/2018 and saved sales order...Next i have changed the schedule line date to 02/20/2018 and saved...now i can see confirmed date as 02/20/2018 on sales order schedule lines.....From which table i can get first system confirmed date (02/16/2018)..??

System given date : 02/16/2018

Manually changed date : 02/20/2018

Kindly help me.