unable to perform date validation using jquery

I have a text box where i will be giving the date in text box and i need to compare that given date in text box with todays date it working for past date which is the expected reult but if i am giving future date its still showing me the validation instead of inserting the date.How can i resolve this issue

Below is my code that i have used

var currentdate = new Date();

var todayDate = (currentdate.getMonth() + 1) + "/" + currentdate.getDate() + "/" + currentdate.getFullYear();

if ($("#txtDate").val() < todayDate) //txtdate is 10/20/2019 and today date is 09/20/2019 but still i am getting validation which should not happen

{

MessageDisp('divAlertMessage', "Date Cannot Be Less Than Today's Date.", 'Error');

return false;

}