What are the procedures for calculating sick leave days according to labor law?

From  the Attendance Module:

• Go to the SubModule “Regulations”
• On “Vacations”  Select “Vacation Type ”
• Select Add
• Enter the Regulation Name 
• Select Paid “NO” 
• On Unpaid hours Field , Enter  the hours that will be deducted from the employee
• Add the balance to it from the Vacation opening balances screen