Poolin calculates the mining profit according to UTC 0: 00-24: 00 for one day.
Poolin system calculates profit of each sub-account in the previous day between 0:00 to 0:30 (UTC time), and display it as yesterday's profit.
Yesterday earning refers to the amount of profit actually paid to you by Poolin. This amount has been deducted from Poolin's fee.