Election Code §201.052

(a) Except as otherwise provided by this code, a special election to fill a vacancy shall be held on the first authorized uniform election date occurring on or after the 46th day after the date the election is ordered. (b) If a law outside this code authorizes the holding of the election on a date earlier than the 46th day after the date of the order, the election shall be held on the first authorized uniform election date occurring on or after the earliest date that the election could be held under that law.