Declarations of Candidacy provided herein must be filed with the secretary of the appropriate election board no earlier than 8:00 a.m. on the first Wednesday of April of any even-numbered year and no later than 5:00 p.m. on the next succeeding Friday. Such Declarations of Candidacy may be transmitted by United States mail, but in no event shall the secretary of any election board accept such Declarations after the time prescribed by law.
Okla. Stat. tit. 26, § 5-110