IceKohl When Rocket Pool node operators register with the network, they may opt to disclose their timezone. The network uses the TZ database to define an operator’s time zone, and in the TZ database there are 500+ time zones. https://en.m.wikipedia.org/wiki/Tz_database
I understand the confusion; most people (me included) typically define time zones with respect to the prime meridian. But, many computer systems leverage this TZ database, and it defines a time zone as any national region where local clocks have all agreed since 1970. This definition concerns itself first with geographic areas which have had consistent local clocks.