Section 235(3) in The Tamil Nadu Building and other Construction Workers (Regulation of Employment and Conditions of Service) Rules, 2006
(3)Where a building worker employed in building or other construct ion work has worked on a rest day and has been given a substituted rest day on anyone of the five days before or the after the rest day, as provided in sub-rule (1) and sub-rule (2), such rest day shall, for the purpose of calculating the weekly hour of work, be included in the week in which such substituted rest day occurs.