The second announcement of the 12th Japanese-Hungarian Symposium on Discrete Mathematics and Its Applications to be held in Budapest, Hungary, between March 21-24, 2023 can be found at https://cs.bme.hu/jh2023/, or can be downloaded in PDF from https://cs.bme.hu/jh2023/jh2023_2nd.pdf. Due to several requests, the deadline for submission was extended until January 15, 2023.