How to Format a JavaScript Date Object as YYYYMMDD?

How to Obtain a String in YYYYMMDD Format from a JavaScript Date Object

In JavaScript, date objects offer a comprehensive set of methods and properties to handle date and time information. However, obtaining a string representation in the specific YYYYMMDD format requires more effort than simply concatenating the individual year, month, and day components.

A Simplified Approach with Date Prototype Extension

To streamline this process, a snippet of code commonly used is the following extension to the Date prototype:

Date.prototype.yyyymmdd = function() {
  var mm = this.getMonth() + 1; // getMonth() is zero-based
  var dd = this.getDate();

  return [this.getFullYear(),
          (mm>9 ? '' : '0') + mm,
          (dd>9 ? '' : '0') + dd
         ].join('');
};

This snippet effectively extends the Date object with a new method called "yyyymmdd." When invoked, it calculates the month (adjusting for zero-based indexing) and day, adding leading zeros if necessary before joining the string components.

Usage Example

To utilize this feature, instantiate a new Date object and call the "yyyymmdd" method to obtain the string representation in YYYYMMDD format:

var date = new Date();
date.yyyymmdd();

By employing this modified snippet, retrieving dates in YYYYMMDD format from JavaScript date objects becomes a swift and straightforward task. No more manual string concatenation is necessary.

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