I believe it is becoming more and more common to ignore the periods in am and pm (in context, of course). I, personally don't like the looks of a comma after the year in a date, but most people disagree with me and use it as well. [ The general rule is that if there's a comma before, a comma must follow.
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Philipdon't like the looks of a comma after the year in a dateAgree. I see no real purpose for it. Nevertheless, I suppose one ought to stick with the same style manual for the whole manuscript, so it rather depends on the style manual.
victoI hate the commas too.We're only talking about one comma; not 'commas'.