Section 266(1)(a) in The U.P. Kshettra Panchayats And Zila Panchayats Adhiniyam, 1961
(a)references to the District Board of a district shall be construed as references to the Zila Panchayat of the district and such enactment, rule, order or notification shall apply to the said Zila Panchayat accordingly;