Minecraft holographic display

Hi, I have two questions about holographic displays:

-How can you display the player name?

-How can you display the time?

With the placeholders

{Display name}

and

{Time}

Source: https://filoghost.me/docs/holographic-displays/placeholders

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The command for the player name would therefore be:

/ hd create blablatest your name: {displayname}

"blablatest" is of course invented by me, that refers to the name or the UID of the hologram.