The feds give the states a total number of days in between certain dates(NM is allowed 107 total duck hunt days), they don't set the actual dates for each state. The state is allowed to pull, say 7 days from the regular season, and add it into the early teal season.
"A man may not care for golf and still be human, but the man who does not like to see, hunt, photograph or otherwise outwit birds or animals is hardly normal. He is supercivilized, and I for one do not know how to deal with him." Aldo Leopold