What is the effective date of the mentioned amendments and acts in this context?
The effective dates of the mentioned amendments and acts in this context are:

1. The Constitution (Fifteenth Amendment) Act, 1963 - With effect from 5-10-1963.
2. The Constitution (Ninety-ninth Amendment) Act, 2014 - With effect from 13-4-2015. However, this amendment was struck down by the Supreme Court in the case of Supreme Court Advocates-on-Record Association and another Vs Union of India in its judgment dated 16-10-2015, AIR 2016 SC 117.