Accrual Plan Days Calculation

Hi,

There is a requirement of accrual plan to be calculated on the monthly basis

the emloyee is entitled to 24 days Annual Leave in a year

entitlement is reduce due to unpaid leave

unpaid Leave Accrual for deduction = no of unpaid lleave days *  per_day_AL_accrual

Where

per_day_AL_accrual = monthly_accrual /(days in that month)

Ex:

Yearly Entitlement = 24

Monthly Entitlement = 24/12 = 2

per_day accrual in Jan = 2 / 31

per_day accrual in Feb = 2 / 28

if employee is on 1 day unpaid leave in Jan

total accrual in Jan = monthly accrual  -  (per_day accrual in Jan)

Is there any oracle standard formula in the accrual plan to achieve this?