Hi Hamidah,
Since the company policy of income calculation in Actual / 30
For example.
1. If the month is 31 days and and the employee new hire date 12 was calculated = Salary / 30 days(Fixed) * actual working days ( 31-12+1=20)
2. If the month is 28 days and and the employee new hire date 12 was calculated = Salary / 30 days(Fixed) * actual working days ( 28-12+1=17)
3. If the month is 30 days and and the employee new hire date 12 was calculated = Salary / 30 days(Fixed) * actual working days ( 30-12+1=19)