No comma is needed but if you want to emphasize today , you can put a comma after it. I think it's emphatic enough at the beginning anyway and therefore I would omit the comma. CB
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TommyfMight you have souce information that I could refer to understand the rules pertaining to this particular case?I'm sorry I can't help you there. I have read advice on punctuation in various books over the years but nowadays I mostly go by my ear...