Man pages matching name rtc in section 4:

rtc.4.en	debian 10 / manpages
rtc.4.de	debian 10 / manpages-de
rtc.4.ja	debian 10 / manpages-ja
rtc.4.en	debian 11 / manpages
rtc.4.de	debian 11 / manpages-de
rtc.4.fr	debian 11 / manpages-fr
rtc.4.ja	debian 11 / manpages-ja
rtc.4.en	debian 12 / manpages
rtc.4.de	debian 12 / manpages-de
rtc.4.fr	debian 12 / manpages-fr
rtc.4.ja	debian 12 / manpages-ja
rtc.4.ru	debian 12 / manpages-ru