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31st vs 31th

The correct phrase here is "31st." "31th" is incorrect. The suffix "st" is used for ordinal numbers ending in 1 (e.g., 1st, 21st), while "th" is used for most other numbers.
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Explained by Miss E.
Editor at TextRanch

Last updated: July 23, 2024

31st

This is the correct form for the ordinal number 31.

Use "31st" when referring to the ordinal number 31, as it follows the standard rule for ordinal numbers ending in 1.

Examples:

  • The event will take place on the 31st of the month.
  • She was born on the 31st of December.

Alternatives:

  • thirty-first

31th

This is an incorrect form for the ordinal number 31.

This form is not used in English. Always use "31st" for the ordinal number 31.

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