When will the libraries open on Sundays again?

Central Library and the regional libraries, i.e. Hardesty Regional, Martin Regional, Rudisill Regional and Zarrow Regional will open on Sunday, September 9, 2012, and will be open from 1 to 5 on Sundays through May 19, 2013 with the exception of December 16, 23 and 30, 2012, and March 31, 2013.
The summer 2013 schedule is as follows: Hardesty Regional, Martin Regional, Zarrow Regional and Rudisill Regional will be open Sundays June 2- August 25 from 1 pm to 5 pm.

Source: Tulsa City-County Library Director's Office.