{
    clearTime: function(g) {
        if (g) {
            return this.clone().clearTime()
        }
        var b = this.getDate();
        this.setHours(0);
        this.setMinutes(0);
        this.setSeconds(0);
        this.setMilliseconds(0);
        if (this.getDate() != b) {
            for (var a = 1, e = this.add(Date.HOUR, a); e.getDate() != b; a++, e = this.add(Date.HOUR, a)) {}
            this.setDate(b);
            this.setHours(e.getHours())
        }
        return this
    },
add: function(b, c) {
        var e = this.clone();
        if (!b || c === 0) {
            return e
        }
        switch (b.toLowerCase()) {
            case Date.MILLI:
                e.setMilliseconds(this.getMilliseconds() + c);
                break;
            case Date.SECOND:
                e.setSeconds(this.getSeconds() + c);
                break;
            case Date.MINUTE:
                e.setMinutes(this.getMinutes() + c);
                break;
            case Date.HOUR:
                e.setHours(this.getHours() + c);
                break;
            case Date.DAY:
                e.setDate(this.getDate() + c);
                break;
            case Date.MONTH:
                var a = this.getDate();
                if (a > 28) {
                    a = Math.min(a, this.getFirstDateOfMonth().add("mo", c).getLastDateOfMonth().getDate())
                }
                e.setDate(a);
                e.setMonth(this.getMonth() + c);
                break;
            case Date.YEAR:
                e.setFullYear(this.getFullYear() + c);
                break
        }
        return e
    }
}