Hello @Madadh_MacLaine ,
The RSVP block's time zone is tied to what's set as the account's time zone. In order to change the time zone listed in an RSVP block, the account's settings will need to be changed (My Account > Account Details > Other Settings > Regional Settings).
As far as removing "the exact time of day," can you elaborate at all on what you're referring to? Are you just not wanting any time listed in the RSVP block at all? If so, then I'd advise using a different layout or block type, such as a text and poll block, to list the information you want to share and capture your contacts wanting or not wanting to attend.
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