BetterDate: a sane JavaScript Date API for handling just dates without UTC issues

BetterDate.ts

class BetterDate {

    private _date: Date;

    constructor(unixTime: number) {
        this._date = new Date(unixTime);
    }

    toDate(): Date {
        return this._date;
    }

    valueOf(): number {
        return this._date.getTime();
    }

    toString(): string {
        return this._date.toISOString().substring(0, 10);
    }

    toAmericanString(): string {
        return this.month + "/" + this.day + "/" + this.year;
    }

    get year(): number {
        return this._date.getUTCFullYear();
    }

    get month(): number {
        return this._date.getUTCMonth() + 1;
    }

    get day(): number {
        return this._date.getUTCDate();
    }

    static parse(input: string): BetterDate {
        var temp = new Date(Date.parse(input));
        var iso = temp.toISOString().substring(0, 10) + "T00:00:00.000Z";
        return new BetterDate(Date.parse(iso));        
    }
} 

// usage:
// var x = BetterDate.parse("2014-01-20");
// var y = BetterDate.parse("Jan 21, 2014");
// x.toString();
// --> "2014-01-20"
// y.toString();
// --> "2014-01-21"     // NOTE: try this with Date.parse in a non-UTC time zone!
// x < y
// --> true
// x.toAmericanString()
// --> "1/20/2014"
// x.year
// --> 2014
// x.month
// --> 1    // NOTE: this is 1-based like it should be!
// x.day
// --> 20   // NOTE: this is the day of the month, not the day of the week, like it should be!