Click on My Site in the left navigation bar, then select Additional Charges.
Select the Scheduled tab.
Click on Add Schedule.
Choose the Additional Charge that you want to apply a schedule to.
Select the Applies from and Applies to dates.
Choose the Days to apply the discount to.
Select the Start and End times to apply the discount to and click Save.
Note: If you want to set an additional charge schedule for 1 day, set Days Applies From as the current day and the day stops applying as the next day and start and end time as 12am to 12am.