Determining Date Inequality with JavaScript

Comparing date values in JavaScript can be done using the Date object. This versatile object allows for easy evaluation of dates against various conditions, including greater than, less than, and not less than.

To compare two dates, simply instantiate a Date object for each date value. Subsequently, utilize the >, = operators to compare the objects. For example, to determine if a date1 is greater than date2, you can write:

if (date1 > date2) {
  // Do something
}

However, it's important to note that using the ==, !=, ===, and !== operators directly with Date objects can lead to inaccurate results. To ensure precise equality checks, use date.getTime() instead. This method returns a timestamp representing the number of milliseconds since January 1, 1970, 00:00:00 UTC.

if (date1.getTime() === date2.getTime()) {
  // Do something
}

To prevent potential input validation issues, it's advisable to use drop-down lists or similar constrained input methods for date entry. This helps ensure that the user enters valid date values.