JavaScript: Get English ordinal suffix for the day of the month

JavaScript Datetime: Exercise-23 with Solution

Day Ordinal Suffix

Write a JavaScript function to get the English ordinal suffix for the day of the month, 2 characters (st, nd, rd, or th).

Test Data :
dt= new Date();
console.log(english_ordinal_suffix(dt));
"23rd"
dt = new Date(2015, 10, 1);
console.log(english_ordinal_suffix(dt));
"1st"

Sample Solution:

JavaScript Code:

// Define a JavaScript function called english_ordinal_suffix with parameter dt (date)
function english_ordinal_suffix(dt)
{
  // Return the day of the month with its ordinal suffix (e.g., 1st, 2nd, 3rd, 4th)
  return dt.getDate() + 
    (dt.getDate() % 10 == 1 && dt.getDate() != 11 ? 'st' : 
    (dt.getDate() % 10 == 2 && dt.getDate() != 12 ? 'nd' : 
    (dt.getDate() % 10 == 3 && dt.getDate() != 13 ? 'rd' : 'th')));
}

// Create a new Date object representing the current date
dt = new Date();
// Output the day of the month with its ordinal suffix for the current date
console.log(english_ordinal_suffix(dt));

// Create a new Date object representing November 1, 2015
dt = new Date(2015, 10, 1);
// Output the day of the month with its ordinal suffix for November 1, 2015
console.log(english_ordinal_suffix(dt));

Output:

20th
1st

Explanation:

In the exercise above,

• The code defines a JavaScript function named "english_ordinal_suffix()" with one parameter 'dt', representing a Date object.
• Inside the english_ordinal_suffix function:
• It retrieves the day of the month from the provided Date object "dt" using the "getDate()" method.
• It checks the remainder when dividing the day of the month by 10 to determine the suffix ('st', 'nd', 'rd', 'th') to append.
• It also checks for exceptions where the suffix differs (e.g., 1st, 2nd, 3rd, but then 'th' for all other cases).
• It constructs and returns the day of the month along with its appropriate ordinal suffix.
• The code then demonstrates the usage of the "english_ordinal_suffix()" function:
• It creates a new Date object "dt" representing the current date (new Date()).
• It outputs the day of the month with its ordinal suffix for the current date by calling the "english_ordinal_suffix()" function with "dt" and logging the result to the console.
• It creates another new Date object "dt" representing November 1, 2015 (new Date(2015, 10, 1)).
• It outputs the day of the month with its ordinal suffix for November 1, 2015 by calling the "english_ordinal_suffix()" function with "dt" and logging the result to the console.

Flowchart:

Live Demo:

See the Pen JavaScript - Get English ordinal suffix for the day of the month-date-ex-23 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus.

Previous: Write a JavaScript function to get a full textual representation of the day of the week (Sunday through Saturday).
Next: Write a JavaScript function to get ISO-8601 week number of year, weeks starting on Monday.