How to check if input date is equal to today's date?

A simple date comparison in pure JS should be sufficient:

// Create date from input value
var inputDate = new Date("11/21/2011");

// Get today's date
var todaysDate = new Date();

// call setHours to take the time out of the comparison
if(inputDate.setHours(0,0,0,0) == todaysDate.setHours(0,0,0,0)) {
    // Date equals today's date
}

Here's a working JSFiddle.

for completeness, taken from this solution:

You could use toDateString:

var today = new Date();
var isToday = (today.toDateString() == otherDate.toDateString());

no library dependencies, and looking cleaner than the 'setHours()' approach shown in a previous answer, imho

Try using moment.js

moment('dd/mm/yyyy').isSame(Date.now(), 'day');

You can replace 'day' string with 'year, month, minute' if you want.