Man pages matching name gnutls_db_check_entry_expire_time in section 3:

gnutls_db_check_entry_expire_time.3.en	debian 10 / gnutls-doc
gnutls_db_check_entry_expire_time.3.en	debian 11 / gnutls-doc
gnutls_db_check_entry_expire_time.3.en	debian 12 / gnutls-doc