Validation of pension rules upholds distinction in pension entitlement despite recent court interpretation affecting retirees' dates. The legislation validates the Central Civil Services (Pension) Rules and related instructions, preserves the Central Government's authority to maintain distinctions in pension entitlement arising from implementation of Central Pay Commission recommendations, responds to a judicial interpretation that eliminated those distinctions, and declares the Part to have effect from the earlier operative date to validate retrospective application for expenditure from the Consolidated Fund of India.