JavaScript: Get a two digit representation of a year

JavaScript Datetime: Exercise-29 with Solution

Two-Digit Year

Write a JavaScript function to get a two-digit year representation.

Test Data:
dt = new Date();
console.log(sort_year(dt));
18
dt = new Date(1989, 10, 1);
console.log(sort_year(dt));
89

Sample Solution:

JavaScript Code:

// Define a JavaScript function called sort_year with parameter dt (date)
function sort_year(dt) 
{ 
  // Convert the full year value of the provided date to a string and extract the last two digits
  return ('' + dt.getFullYear()).substr(2);
}

// Create a new Date object representing the current date
dt = new Date(); 
// Output the last two digits of the full year value for the current date
console.log(sort_year(dt)); 

// Create a new Date object representing November 1, 1989
dt = new Date(1989, 10, 1); 
// Output the last two digits of the full year value for November 1, 1989
console.log(sort_year(dt));

Output:

18
89

Explanation:

In the exercise above,

• The code defines a JavaScript function named "sort_year()" with one parameter 'dt', representing a Date object.
• Inside the sort_year function:
• It converts the full year value of the provided Date object "dt" to a string using the "getFullYear()" method.
• It then extracts the last two digits of the string representation of the full year using the "substr()" method.
• The code then demonstrates the usage of the "sort_year()" function:
• It creates a new Date object "dt" representing the current date using 'new Date()'.
• It outputs the last two digits of the full year value for the current date by calling the "sort_year()" function with 'dt' and logging the result to the console.
• It creates another new Date object "dt" representing November 1, 1989, using 'new Date(1989, 10, 1)'.
• It outputs the last two digits of the full year value for November 1, 1989, by calling the "sort_year()" function with 'dt' and logging the result to the console.

Flowchart:

Live Demo:

See the Pen JavaScript - Get a two digit representation of a year-date-ex-29 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that extracts the last two digits of the year from a Date object.
• Write a JavaScript function that converts a full year number into a two-digit string using modulo operations.
• Write a JavaScript function that formats the year in a Date object to two digits, adding a leading zero if necessary.
• Write a JavaScript function that handles years before 1000 by ensuring the two-digit representation is correct.

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