38 C.F.R. § 21.1033
The provisions of this section are applicable to informal claims and formal claims.
(a) Failure to furnish form, information, or notice of time limit. VA's failure to give a claimant or potential claimant any form or information concerning the right to file a claim or to furnish notice of the time limit for the filing of a claim will not extend the time periods allowed for these actions.
(Authority: 38 U.S.C. 5101, 5113)
(c) Time limit for filing a claim for an extended period of eligibility under 10 U.S.C. chapter 1606, or 38 U.S.C. chapter 30, 32, 33, or 35. VA must receive a claim for an extended period of eligibility provided by § 21.3047, § 21.5042, § 21.7051, § 21.7551, or § 21.9535 by the later of the following dates:
(2) One year from the date on which the spouse's, surviving spouse's, veteran's, reservist's, or other eligible individual's physical or mental disability no longer prevented him or her from beginning or resuming a chosen program of education.
(Authority: 10 U.S.C. 16133(b); 38 U.S.C. 3031(d), 3232(a), 3321, 3512)
(d) Time limit for filing for an extension of eligibility due to suspension of program (38 U.S.C. chapter 35). VA must receive a claim for an extended period of eligibility due to a suspension of an eligible child's program of education as provided in § 21.3043 by the later of the following dates.
(2) One year from the date on which the condition that caused the suspension of the program of education ceased to exist.
(Authority: 38 U.S.C. 3512(c))
(e) Extension for good cause.
(1) VA may extend for good cause a time limit within which a claimant or beneficiary is required to act to perfect a claim or challenge an adverse VA decision. VA may grant such an extension only when the following conditions are met:
(2) Denials of time limit extensions are separately appealable issues.
(Authority: 38 U.S.C. 5101, 5113)
(f) Computation of time limit.
(2) The first day of the specified period referred to in paragraph (f)(1) of this section will be the date of the letter of notification to the claimant or beneficiary for purposes of computing time limits. As to appeals, see §§ 20.203 and 20.110 of this chapter.
(Authority: 38 U.S.C. 501(a))
[64 FR 23771, May 4, 1999, as amended at 71 FR 1497, Jan. 10, 2006. Redesignated and amended at 72 FR 16965, 16966, Apr. 5, 2007; 74 FR 14665, Mar. 31, 2009; 84 FR 194, Jan. 18, 2019]