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What is the difference between '8:00 o'clock' and saying only '8' in writing letters?

When we can use the first one and when we can use the second one?

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    How formal are you being? I haven't written o'clock in a very long time. I usually just write 8 pm... I'm in the US, so we use 12 hour clocks, not sure the standard for 24 hour clocks, though. – Catija Feb 12 '15 at 8:12
  • I just asked for using in writing letters – Ice Girl Feb 12 '15 at 8:17
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    Right, but letters can be of differing formalities. If you're writing a professional letter to an organization, you will want to be more formal than if you're sending a birthday note to your sister. – Catija Feb 12 '15 at 8:19
  • You can start by saying that who is the recipient of your letter. – M.A.R. Feb 12 '15 at 8:51
  • OK. I got it. :) – Ice Girl Feb 12 '15 at 8:53
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Unless it is overly formal, I would leave off the o'clock. And you should add AM or PM :

I am planning to go to the beach at 8AM on Friday.

But if it is very clear in context, you could just use the numeral:

After I left work, I met Laura at 8.

(AmE applicable to the 12 hour clock system.)

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