Ah, I see where you may have gone wrong with the clock toggling...
when the /nui .... slash command lists show {....} curly braces it means type one of the options within it...
In the case of the clock commands it would be displayed as /nui clock {server|local} which means you either type /nui clock server to display the server time or /nui clock local to display the local time.
I hope that clears things up a bit.
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