(a) Except as provided by Subsections (b) and (d), the registration of a voter described by this subsection whose information is changed on the registration records becomes effective as to the change on the 30th day after:
(1) the date the voter submits to the registrar a notice of a change in registration information under § 15.021 or a response under § 15.053, indicating the change; or
(2) the date the voter submits a statement of residence to an election officer under § 63.0011 or a registration application or change of address to an agency employee under Chapter 20, indicating the change.
(b) A change in registration information covered by this section is effective for purposes of early voting if it will be effective on election day.

(c) For purposes of determining the effective date of a change in registration information covered by this section, a document submitted by mail is considered to be submitted to the registrar on the date it is placed with postage prepaid and properly addressed in the United States mail. The date indicated by the post office cancellation mark is considered to be the date the document was placed in the mail unless proven otherwise.
(d) If the 30th day before the date of an election is a Saturday, Sunday, or legal state or national holiday, the document is considered to be timely if it is submitted to the registrar on or before the next regular business day.