What time period did the musical Annie take place?

Annie the musical started its pre-Broadway tryout at the Goodspeed Opera House in East Haddam, Connecticut on August 10, 1976 with Kristen Vigard as Annie. After a week of performances though, she was replaced by Andrea McArdle who went on to play Annie in the Broadway Production, which opened on April 21, 1977 at the Alvin Theatre and closed on January 2, 1983.