[Code of Federal Regulations] [Title 24, Volume 1] [Revised as of April 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 24CFR58.21] [Page 416] TITLE 24--HOUSING AND URBAN DEVELOPMENT PART 58_ENVIRONMENTAL REVIEW PROCEDURES FOR ENTITIES ASSUMING HUD ENVIRONMENTAL RESPONSIBILITIES--Table of Contents Subpart C_General Policy: Environmental Review Procedures Sec. 58.21 Time periods. All time periods in this part shall be counted in calendar days. The first day of a time period begins at 12:01 a.m. local time on the day following the publication or the mailing and posting date of the notice which initiates the time period.