Section 21(2)(b) in The Administrative Tribunals Act, 1985
(b)no proceedings for the redressal of such grievance had been commenced before the said date before any High Court, the application shall be entertained by the Tribunal if it is made within the period referred to in clause (a), or, as the case may be, clause (b), of sub-section (1) or within a period of six months from the said date, whichever period expires later.