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 session), the data related to assets and positions may 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 00:00 (midnight).
If you select MKT+Pre/Post-MKT, during the overnight session , the data related to assets and positions will be calculated using the post market closing price, and will not change with the overnight market; Daily P&L will be reset at 00:00 (midnight).