Previously shared by my good friend link
My approach to comparison of dates would be to first.
Get them both to tangible values we can work with.
We do this with the valueOf method or the getTime method, I will use valueOf for this example :)
var a = new Date();
var b = new Date();
var c = new Date();
c.setHour(c.getHour() + 1); // set to 1 hour after var a & b
a == b; // returns false
a > b; // returns false
a < b; // returns false
b.valueOf() == a.valueOf(); // returns true
c.valueOf() > a.valueOf(); // returns true
parseInt(b.valueOf() / 1000) == parseInt(a.valueOf() / 1000); // comparing he values removing milliseconds. Should still return true.
parseInt(c.valueOf() / 1000/60/60/24) == parseInt(a.valueOf() / 1000/60/60/24); // comparing C to B but this time ignoring hour difference. only comparing day itself. Should return true.
Take note that after this you will not be able to account for monthly differences due to the calendar month differences.