Allowability of retrospective amendment which impairs existing right or obligation

In the case of Mithilesh Kumar & another v. Prem Bahadur Khare AIR 1989 SC 1247, The Apex Court in para 21 of the judgment held that  ‘A retrospective operation is not given to a statute so as to impair existing right or obligation otherwise than as a matter of procedure….. But laws made justly for the benefit of individuals and the community as a whole may relate to a time antecedent to their commencement.’ SUPREME COURT OF INDIA MITHILESH KUMARI & ANR. Vs. PREM BEHARI KHARE DATE OF JUDGMENT- 14/02/1989 BENCH: SAIKIA, K.N. (J) , OZA, G.L. (J) CITATION:�...