The counting of milliseconds between two specified dates helps us to find the number of hours, days, months, etc. by doing easy calculations.
It contains a single parameter string that represents a date. This method returns a number that represents the number of milliseconds.
Let's see some illustrations of using the parse() method. In the first example, we are passing the valid date value, and in the second example, we are passing the invalid date value to see the result.
In this example, we are passing a valid date to get the number of milliseconds between the specified date and midnight of January 1, 1970.
Here, the specified date is "June 19, 2020".Test it Now
In this example, we are passing an invalid date to see what happens when we provide invalid input.Test it Now
In the output, we can see the result is NaN.