When calculating the market value and P&L of US stocks, you can select the time period to be covered in the calculation. Please be aware that:
If you select whole day (including overnight),P&L data will change with the overnight market during the overnight period. Daily P&L will be reset at 20:00 ET, and T-1 Daily P&L values will be displayed between 20:00 and 24:00 ET.
If you select MKT+Pre/Post-MKT, during the overnight market session , the data related to assets and positions will be calculated with post market closing price, and will not change with the overnight market. Daily P&L will be reset at 24:00 ET.