12th can be written "twelfth" or "12th"
4,096
XIIth
twelfth
twelveth
12th June 1575
You write it as 12th, honey. "12nd" is as incorrect as thinking you can wear socks with sandals and still be fashionable. Stick to the rules of English like your life depends on it, darling.
no
325
tomorrow
TODAY
If that was the date were currently, the answer would be "today".