<ion-datetime displayFormat="MMMM YY" min="{{min}}" max="{{max}}"></ion-datetime>
Now you need the min and max value.
First, let find out today and next month.
const today = moment(new Date()).format('YYYY-MM-DD');
const nextMonth = moment(today).add(1, 'M');
var nextMonthEnd = moment(nextMonth).endOf('month');
if(today.date() != nextMonth.date() && nextMonth.isSame(nextMonthEnd.format('YYYY-MM-DD'))) {
nextMonth = nextMonth.add(1, 'd');
}
console.log(today.format('DD-MM-YYYY'));
console.log(nextMonth.format('DD-MM-YYYY'));
Now
this.min = this.today;
this.max = this.nextMonth