Why does 12 use “th” instead of “rd”? It’s a special rule in English. Numbers like 11, 12, and 13 are exceptions due to how they sound and their historical formation in the language. They always end with “th.” This makes “12th” the standard and correct form, not “12th.”
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Exception: Even though 11th, 12th, and 13th end in 1, 2, and 3, they still take “th” because of their special spelling and pronunciation: 11th, 12th, 13th (not 11st, 12nd, or 13rd) Common Uses of Ordinal Numbers in English Ordinal numbers are used in everyday English to show position, order, or rank in many real-life situations.
For example, when you are talking about your 12th birthday, you say “My twelfth birthday,” not “My 12nd birthday.” This rule helps keep your English clear and correct.
When it comes to writing ordinal numbers, there seems to be a common confusion between whether to use "12nd" or "12th." The correct form, without a doubt, is "12th."