October 12, 20**
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How do you read it?
1. October twelfth, twenty blah blah
2. October twelfth, twenty asterisk asterisk
3. October twelve, twenty blah blah
4. October twelve, twenty asterisk asterisk
1 or 3 will work fine
some would also say "twenty-something"
no one really ever says "asterisk" when seeing one in print. (In fact, many mispronounce it as "asterik" or "asterix")