Sets/unsets permaday for worlds
-u, -o, -off - turns off permaday for the worlds
other arguments - list of worlds to affect
/permaday
Sets permaday in the world you are in
/permaday -o UHC
Turns off permaday in the world UHC
/permday SB-1 SB-2
Turns on permaday in the worlds SB-1 and SB-2
uhc.command.permaday - allows use of the command, default op