The 21St Or 21Th? Understanding The Correct Usage


Are you confused about whether to use 21st or 21th when writing dates? You’re not alone. This is a common mistake that many people make. In this article, we’ll explain the correct usage of these terms and clear up any confusion.

What Does 21st Mean?

First, let’s define what we mean by 21st. The 21st is used to refer to the 21st day of a month or the 21st century. For example, if today is the 21st of May, we would write it as May 21st.

The Difference Between 21st and 21th

Now, let’s talk about the difference between 21st and 21th. The correct way to write the ordinal number for 21 is 21st. The reason for this is that the ending “st” is used for all numbers ending in “1” (except for 11). On the other hand, “21th” is incorrect. It is not a valid ordinal number and should never be used.

Examples of Correct Usage

Here are a few examples of correct usage: – Today is the 21st of June. – The 21st century began in 2001. – My birthday is on the 21st of August.

Additional Tips

When writing dates, it’s important to use the correct format. In most cases, the format is month-day-year. For example, June 21, 2023. However, in some countries, the format is day-month-year. Make sure you know which format is used in your region. It’s also a good idea to spell out the month instead of using the abbreviation. This makes it easier for international readers to understand the date.


In conclusion, 21st is the correct way to write the ordinal number for 21. 21th is incorrect and should never be used. Remember to use the correct format when writing dates and spell out the month to avoid confusion. By following these simple tips, you can ensure that your writing is clear and easy to understand.

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