I will be there at 10am and you can join me anytime. m. ) I will be there at 10am, you can join me anytime.
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Grammar GeekI will be there at 10am and you can join me anytime. Some traditionalists, like me, would put a comma after 10 a.m. (Do leave a space between 10 and am.)
In British English, it is correct to write 10am. (no space and no periods)