The clock is five minutes fast/faster, early/earlier.

[siCantikManis]

Hi,

Which should I use to say that the time is really noon but the clock says it's 12:05?

The clock is five minutes fast=>I think this is OK.
The clock is five minutes faster=>I think clock doesn't run like a person.
The clock is five minutes early=>I'm clueless.
The clock is five minutes earlier=>I think this sounds weird.

Is there any other way to say it? Or do above sentences have other meanings?

Many thanks,
Cantik
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[Ralf]

Hi si,

Your watch seems to be 5 minutes fast.

Take care,

Ralf
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[Barb_D]

The opposite is "it's five minutes slow."

[Paul Nis]

You could also say,

"The clock is 5 minutes faster than my watch."
"The clock is running slow."