What we checked. The notification was issued by the Town & Country Planning Department, Haryana, under Section 84 of the Real Estate (Regulation and Development) Act, 2016. Rule 1(2) says the rules come into force on the date of their publication in the Official Gazette.
Practical point. The rules have been amended; the regulator also issues regulations (for example on project registration). Read the current consolidated text on the regulator's website.