No, sales before three o'clock are calculated based on today's value, so today's decline will be included in it.

Sales after three o'clock are calculated based on the value of the next day. If the price continues to fall the next day, the income will also decrease.

If it goes up the next day, then the profit increases.

My answer to you is March 19, Friday. If you sell before 3 o'clock, it will be counted as today. If you sell after 3 o'clock, it will be calculated as the price of next Monday.