Absence Quota Generation for USA

dear Gurus,

i need inputs on generating quotas for employees in USA.

Newly Hired Emp

1. New employees hired between Jan 1 & June 30 are eligible for 1 week of paid vacation after completing 6 months of service. new employees will be eligible for 2 weeks of paid vacation the following year effective on their anniversary date

2. New employees hired between July 1 & Dec 31 are eligible for 2 weeks of paid vacation after completing 1 year of service. However, these employees may use one of these 2 weeks after completing 6 months of service.

3. After an employee completes 12 months of service from his hire date, he is eligible for 2 weeks of paid vacation on Jan 1st, following his 1 year anniversary

can this be handled through standard R/3 config or rules or some z program?

inputs appreciated.