JAVASCRIPT

javascript check if date is less than today

function TDate() {
    var UserDate = document.getElementById("userdate").value;
    var ToDate = new Date();

    if (new Date(UserDate).getTime() <= ToDate.getTime()) {
          alert("The Date must be Bigger or Equal to today date");
          return false;
     }
    return true;
}

javascript check date greater than today

function isDateInFuture(date) {
    return date > Date.now()
}

console.log(isDateInFuture(new Date("2025-01-01")) //true
console.log(isDateInFuture(new Date("2000-03-11")) //false

javascript check date is greater than today

// make use of date-fns

const date1 = endOfDay(dateToCompare) // passed date with time 00:00
const date2 = endOfDay(new Date()) // get current Date with time 00:00

if (isAfter(date1, date2)) {
	console.log(`The passed Date: ${date1} lies in the future`
}

javascript date validation less than today

check this thread:
https://stackoverflow.com/questions/492994/compare-two-dates-with-javascript