For years in Tennessee opening day of Dove season was Sept 1. So many "Blue Collar" workers who were most often unable to get off from work during the workweek kept complaining that it was moved to the First Sat of Sept. This has been in effect for a number of years now. Squirrel season here also traditionally opened on Sept 1, it has now been moved up to a Sat in late Aug. Quail & Rabbit seasons have also been changed from their long traditional Thanksgiving Day opener to earlier in Nov.
Some of these changes have been in effect long enough that many younger hunters consider them "Traditional". The older dates however stood for a long period of time & all were "Traditional" back when I began hunting in the 1950's & continued on for a number of years after that. Some of these dates of course varied according to the State you were from.