如何在条件语句中使用 javascript new Date() 对象？

Question

How do I implement javascript new Date() objects in a conditional statement? What I want to accomplish is when a user uses a date input that is either today, a date that passed, or less than two weeks from today. The conditional statement will prevent the code from continuing using else

but somehow the output shows that the conditional statement is satisfied.

Here is my code:

var getDateAndConsent = {
    getGoalDate: new Date($('#achiveG').val()), //"dd-mm-yyyy"
    getYN: $('inputMaintain').val(),
} //getGoalDate: new Date($('#achiveG').val()), this code should get the input date which returns as a string

//nextnextweek
Date.prototype.addDays = function() {
    var date = new Date(this.valueOf());
    date.setDate(date.getDate() + 21);
    return date;
}//sets the date object for two weeks from now

//yesterday
Date.prototype.minusDays = function() {
    var date = new Date(this.valueOf());
    date.setDate(date.getDate() - 1);
    return date;
}//sets the date object for yesterday

//vars to store the converted new Date() objects
var today = new Date();
var date1 = new Date();
var date2 = new Date();

alert(today); //returns Thu Feb 06 2020 19:44:58 GMT+0800 (Philippine Standard Time)
alert(date1.addDays()); //Thu Feb 27 2020 19:44:58 GMT+0800 (Philippine Standard Time)
alert(date2.minusDays()); //Wed Feb 05 2020 19:44:58 GMT+0800 (Philippine Standard Time)
alert(getDateAndConsent.getGoalDate); //Wed Feb 12 2020 08:00:00 GMT+0800 (Philippine Standard Time) this is a user input example only

if (getDateAndConsent.getGoalDate < date1.addDays() || getDateAndConsent.getGoalDate > date2.minusDays() || getDateAndConsent.getGoalDate == today){
    firebase.auth().onAuthStateChanged(function(user){
        if(user){
            this.userId = user.uid; //stores the userid
        }
    firebase.firestore().collection("users").doc(userId).collection("goal").doc(americanDate).set({
        'bgReading': data.inputWeight, 'dateAdded': data.dateAdded, 
        'isActive': data.isActive,
    })
    .then(function(){
        window.alert("Weight goal updated!");
        window.location.href = "diabetesManagement.php"; 
    })
    .catch(function(error){
        console.log("Error updating weight goal: ", error);
        window.alert("Error updating weight goal: " + error);
    });
});
}
else{
window.alert("error date")
}
});
})();

Answer 1

I think the issue rely in comparing dates without getTime()

 var getDateAndConsent = { getGoalDate: function(){ var x = new Date(); x.setDate(x.getDate()+10); return x; }() } //nextnextweek Date.prototype.addDays = function() { var date = new Date(this.valueOf()); date.setDate(date.getDate() + 21); return date; }//sets the date object for two weeks from now //yesterday Date.prototype.minusDays = function() { var date = new Date(this.valueOf()); date.setDate(date.getDate() - 1); return date; }//sets the date object for yesterday //vars to store the converted new Date() objects var today = new Date(); var date1 = new Date(); console.log(today); console.log(date1.addDays()); console.log(getDateAndConsent.getGoalDate); console.log(getDateAndConsent.getGoalDate.getTime() < date1.addDays().getTime())