$ for m in $(seq 0 11); do ./date --date=@$((1770853362 + $m * 2592000)); done
2026. Feb. 12., Thursday, 00:42:42 CET
2026. Mar. 14., Saturday, 00:42:42 CET
2026. Apr. 13., Monday, 01:42:42 CEST
2026. May. 13., Wednesday, 01:42:42 CEST
2026. Jun. 12., Friday, 01:42:42 CEST
2026. Jul. 12., Sunday, 01:42:42 CEST
2026. Aug. 11., Tuesday, 01:42:42 CEST
2026. Sep. 10., Thursday, 01:42:42 CEST
2026. Oct. 10., Saturday, 01:42:42 CEST
2026. Nov. 9., Monday, 00:42:42 CET
2026. Dec. 9., Wednesday, 00:42:42 CET
2027. Jan. 8., Friday, 00:42:42 CET
Previously I reported #10921, which was fixed in 72c782f.
But the localization doesn't work once again.
Through bisection, I found that it was ruined by commit a7f55cb.