Dear Sagar,
Whether the employee is performing well. If good then you can confirm him/her. Any way you have the confirmation due date you dont change that. Since due to illness he/she would have taken leave and also would have not paid for that days as a probation employee.
Still the performance is not upto the mark you can extend the probation it can be maximum of 3 months only(since your actual probation period is 3 months in your organisation).
Whether the employee is performing well. If good then you can confirm him/her. Any way you have the confirmation due date you dont change that. Since due to illness he/she would have taken leave and also would have not paid for that days as a probation employee.
Still the performance is not upto the mark you can extend the probation it can be maximum of 3 months only(since your actual probation period is 3 months in your organisation).